Go Back
–+ servings
slices of flank steak and onions served over mashed potatoes
Print Recipe
Be the first to rate it!

Crock Pot Flank Steak

Tender, flavorful Crock Pot Flank Steak made easy! A slow-cooked dinner that’s juicy, hearty, and perfect for busy weeknights.
Prep Time15 minutes
Cook Time4 hours
Resting Time10 minutes
Total Time4 hours 25 minutes
Course: Main Dishes, Slow Cooker
Cuisine: American
Keyword: Crock Pot Flank Steak
Servings: 8 servings
Calories: 180kcal
Author: Lois

Equipment

Ingredients

  • 1½ - 2 pound flank or London Broil steak
  • 1 onion sliced
  • 1 teaspoon chili powder
  • 1 teaspoon garlic powder
  • ½ teaspoon sugar
  • salt and pepper to taste
  • 1 tablespoon olive oil, divided
  • 2 tablespoons red wine vinegar

Instructions

  • Season the steak on both sides with the seasonings.
  • Heat a heavy skillet over medium-high heat. Add 2 teaspoons of olive oil and swirl around the skillet. Add the steak to the skillet and cook until browned without moving, about 3 minutes per side.
  • Meanwhile, pour the remaining olive oil into the slow cooker crock and swirl around the bottom. Over the olive oil, place the onions.
  • When the steak is browned on both sides, transfer the steak to the slow cooker and place over the onions.
  • Pour the red wine vinegar into the skillet, scraping to remove any stuck on pieces. Pour the sauce over the steak.
  • Cover the slow cooker and cook on low for 4 hours.
  • Transfer the steak to a cutting board and allow it to rest for 10 minutes before slicing thinly.
  • Return the steak to the slow cooker or serve on a platter with the onions and juices.

Notes

Tips
  • Sear the steak before slow cooking to enhance flavor and texture.
  • Slice the cooked meat thinly against the grain for maximum tenderness.
  • Add extra broth or vinegar for more sauce and flavor depth.
Storage & Make Ahead
  • Store leftovers in an airtight container in the refrigerator for up to 3 days.
  • Flank steak can be frozen for up to 2 months; thaw overnight in the fridge.
  • Prepare

Nutrition

Serving: 1serving | Calories: 180kcal | Carbohydrates: 2g | Protein: 25g | Fat: 7g | Saturated Fat: 3g | Polyunsaturated Fat: 0.4g | Monounsaturated Fat: 4g | Cholesterol: 68mg | Sodium: 65mg | Potassium: 418mg | Fiber: 0.4g | Sugar: 1g | Vitamin A: 74IU | Vitamin C: 1mg | Calcium: 28mg | Iron: 2mg