Slow Cooker Steak, Peppers & Onions

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🥩 The Ultimate Slow Cooker Steak, Peppers & Onions Hack!

Stop scrolling and save this effortless slow cooker dinner! Tender strips of beef, colorful bell peppers, and sweet onions slowly cook together in a rich, savory sauce for a meal that’s packed with comforting flavor.

This Slow Cooker Steak, Peppers & Onions recipe is one of those easy dinners you can prep in minutes and let the Crockpot do the work. The beef becomes tender while the peppers and onions soak up all the delicious savory juices.

Serve it over mashed potatoes, rice, egg noodles, or toasted bread for a hearty family dinner that’s perfect for busy weeknights.

Why You’ll Love This Slow Cooker Steak Recipe

  • 🥩 Tender, flavorful steak
  • đź«‘ Colorful bell peppers
  • 🧅 Sweet, slow-cooked onions
  • đź«• Easy Crockpot preparation
  • 🍲 Rich and savory gravy
  • ⏰ Perfect for busy days
  • 🍚 Delicious over rice or potatoes
  • 👨‍👩‍👧 Family-friendly comfort food

Ingredients

  • 2 pounds beef sirloin steak, thinly sliced
  • 2 tablespoons olive oil
  • 1 large yellow onion, sliced
  • 2 bell peppers, sliced
  • 3 cloves garlic, minced
  • 1 ½ cups beef broth
  • 2 tablespoons Worcestershire sauce
  • 1 tablespoon soy sauce
  • 1 tablespoon tomato paste
  • 1 teaspoon Italian seasoning
  • ½ teaspoon smoked paprika
  • ½ teaspoon black pepper
  • ½ teaspoon salt
  • 2 tablespoons cornstarch
  • 3 tablespoons cold water
  • 2 tablespoons chopped fresh parsley, for garnish

How to Make Slow Cooker Steak, Peppers & Onions

Step 1: Slice the Steak

Thinly slice the sirloin steak against the grain.

Slicing against the grain helps shorten the muscle fibers and gives you more tender bites after cooking.

Step 2: Brown the Beef

Heat olive oil in a large skillet over medium-high heat.

Add the sliced beef in batches and quickly brown the outside.

You don’t need to cook the steak completely. The goal is simply to develop extra flavor.

Transfer the browned beef to the slow cooker.

Step 3: Add the Vegetables

Add the sliced onion, bell peppers, and minced garlic to the Crockpot.

Spread the vegetables evenly around the beef.

Step 4: Make the Sauce

In a bowl, whisk together:

  • Beef broth
  • Worcestershire sauce
  • Soy sauce
  • Tomato paste
  • Italian seasoning
  • Smoked paprika
  • Black pepper
  • Salt

Pour the sauce over the beef, peppers, and onions.

Step 5: Slow Cook

Cover the Crockpot and cook on:

LOW for 5–6 hours

or

HIGH for 2 ½–3 ½ hours

The beef should be tender and the vegetables softened.

Cooking time can vary depending on the cut and thickness of the beef.

Step 6: Thicken the Sauce

About 15–20 minutes before serving, mix the cornstarch and cold water in a small bowl until smooth.

Stir the slurry into the slow cooker.

Cover and continue cooking until the sauce thickens into a rich gravy.

Step 7: Garnish and Serve

Taste and adjust the seasoning if needed.

Sprinkle fresh parsley over the top.

Serve hot over your favorite side.

What Does Slow Cooker Steak, Peppers & Onions Taste Like?

This dish is savory, hearty, and incredibly comforting.

The beef absorbs the flavors of Worcestershire sauce, soy sauce, garlic, and herbs while the peppers and onions become soft and flavorful.

The finished gravy is rich and savory with just enough sweetness from the slow-cooked onions and peppers.

It’s simple comfort food that tastes like it took much longer to prepare than it actually did.

The Slow Cooker Hack

The secret to getting the best flavor is quickly browning the beef before adding it to the Crockpot.

This extra step helps create a flavorful exterior and adds browned bits to the skillet that can be incorporated into the sauce.

If you’re in a hurry, you can skip browning and add the raw sliced beef directly to the slow cooker, but browning gives the dish an extra layer of flavor.

Tips for Tender Slow Cooker Steak

Slice Against the Grain

This is one of the easiest ways to improve the texture of sliced beef.

Don’t Overcrowd the Skillet

If browning the beef, work in batches. Overcrowding can cause the beef to steam instead of brown.

Use a Good Cut of Beef

Sirloin works well, but other cuts can also be used depending on your preference.

Don’t Add Too Much Liquid

The vegetables release moisture as they cook, so the amount of broth in this recipe is enough to create a flavorful sauce without making it overly watery.

Thicken at the End

Adding the cornstarch slurry near the end allows you to control the final consistency of the gravy.

Can I Use Another Cut of Beef?

Yes! Depending on what’s available, you can use:

  • Sirloin steak
  • Top round
  • Chuck steak
  • Flank steak
  • Beef stew meat

For tougher cuts, cooking on LOW generally gives the connective tissue more time to soften.

Can I Use Frozen Peppers?

Yes. Frozen sliced bell peppers can be used when fresh peppers aren’t available.

Keep in mind that frozen peppers may have a softer texture after slow cooking.

Easy Variations

Steak and Cheese

Top the finished beef with shredded provolone or mozzarella and let it melt before serving.

Philly-Style Slow Cooker Steak

Serve the beef, peppers, and onions inside toasted hoagie rolls with melted cheese.

Steak and Mushrooms

Add sliced mushrooms for an extra savory flavor.

Spicy Steak and Peppers

Add sliced jalapeños, red pepper flakes, or a pinch of cayenne.

Steak and Potatoes

Add cubed potatoes to the Crockpot for an easy all-in-one dinner.

What to Serve with Slow Cooker Steak, Peppers & Onions

There are so many delicious ways to serve this meal.

Try it with:

  • Mashed potatoes
  • White rice
  • Brown rice
  • Egg noodles
  • Buttered noodles
  • Roasted potatoes
  • French fries
  • Crusty bread
  • Hoagie rolls
  • Steamed green beans
  • Roasted broccoli
  • Simple green salad

For a Philly-inspired meal, pile the steak, peppers, and onions into toasted rolls and add melted cheese.

How to Store Leftovers

Allow the leftovers to cool before transferring them to an airtight container.

Store in the refrigerator for up to 3–4 days.

Reheat gently on the stovetop or in the microwave until heated through.

If the gravy becomes too thick, add a small splash of beef broth while reheating.

Can You Freeze Slow Cooker Steak?

Yes. Allow the steak and sauce to cool completely before placing them in a freezer-safe container.

Freeze for up to 3 months for best quality.

Thaw overnight in the refrigerator and reheat gently.

Frequently Asked Questions

What is the best steak for the Crockpot?

Sirloin is a convenient option for sliced steak, while tougher cuts such as chuck can become tender with longer slow cooking.

Can I skip browning the steak?

Yes. Browning isn’t required, but it adds extra flavor to the finished dish.

Can I add potatoes?

Absolutely. Add evenly sized potato chunks for a more complete one-pot-style dinner.

Can I make this recipe spicy?

Yes. Add jalapeños, red pepper flakes, or another mild spicy seasoning.

Can I make this recipe ahead of time?

Yes. The cooked steak and vegetables can be refrigerated and reheated gently when you’re ready to serve.

Slow Cooker Steak, Peppers & Onions Recipe Card

Prep Time: 15 minutes
Cook Time: 5–6 hours on LOW
Total Time: About 5 hours 15 minutes
Servings: 6

Ingredients

  • 2 pounds beef sirloin steak, thinly sliced
  • 2 tablespoons olive oil
  • 1 large yellow onion
  • 2 bell peppers
  • 3 cloves garlic
  • 1 ½ cups beef broth
  • 2 tablespoons Worcestershire sauce
  • 1 tablespoon soy sauce
  • 1 tablespoon tomato paste
  • 1 teaspoon Italian seasoning
  • ½ teaspoon smoked paprika
  • ½ teaspoon black pepper
  • ½ teaspoon salt
  • 2 tablespoons cornstarch
  • 3 tablespoons cold water
  • Fresh parsley

Instructions

  1. Thinly slice the beef against the grain.
  2. Quickly brown the beef in olive oil and transfer it to the Crockpot.
  3. Add sliced onions, bell peppers, and garlic.
  4. Whisk together beef broth, Worcestershire sauce, soy sauce, tomato paste, and seasonings.
  5. Pour the sauce over the beef and vegetables.
  6. Cover and cook on LOW for 5–6 hours or HIGH for 2 ½–3 ½ hours.
  7. Mix cornstarch with cold water.
  8. Stir the slurry into the Crockpot during the final 15–20 minutes.
  9. Cook until the gravy thickens.
  10. Garnish with fresh parsley.
  11. Serve over rice, mashed potatoes, noodles, or toasted rolls.

Final Thoughts

This Slow Cooker Steak, Peppers & Onions recipe is the ultimate easy comfort-food dinner. Tender beef, sweet onions, colorful peppers, and rich savory gravy come together with very little hands-on work.

Whether you serve it over mashed potatoes, spoon it onto rice, or turn it into a cheesy steak sandwich, this Crockpot recipe is an easy dinner you’ll want to make again and again.

Save this recipe for your next busy weeknight—you’ll be glad you did!

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Make this easy Slow Cooker Steak, Peppers & Onions with tender beef, colorful peppers, sweet onions, and rich savory gravy for the ultimate Crockpot comfort-food dinner.