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Steak and Caramelized Onion Frittata (Whole30, Keto, Paleo)

Have leftover steak? Make my Steak and Caramelized Onion Frittata that will serve as an amazing breakfast, brunch, lunch or dinner. Whole30, Keto, Paleo and Dairy Free.

  • Total Time: 35 minutes
  • Yield: 8 servings 1x


  • 12 large eggs, beaten
  • 1 tbsp ghee
  • 68 oz leftover steak, chopped
  • 2 tbsp Mac’s Awesome Sauce
  • 1 large yellow onion, sliced
  • 1/2 tsp salt
  • 1/4 tsp pepper (or more to taste)
  • 2 large cloves garlic, minced
  • Micro greens, Caramelized Onions and extra Mac’s Awesome Sauce for garnish


  1. Heat a cast iron skillet over medium heat with 1 tbsp ghee.
  2. Preheat the oven to 350°F
  3. Add the minced garlic along and sliced yellow onion to the skillet. Brown together until the onions are caramelized, around 6-7 minutes. Remove a couple of tbsp of caramelized onions and set to the side for garnish. 
  4. Add in the chopped steak and allow to cook together with the onions for 2-3 minutes. 
  5. Meanwhile, whisk the 12 eggs together along with Mac’s Awesome Sauce, salt and pepper until completely combined.
  6. Pour the egg mixture on top of the steak, onions and garlic in skillet. Make sure the mixture is spread evenly over the beef for even cooking.
  7. Add the cast iron skillet to the oven and allow to cook 25-30 minutes.
  8. Garnish with the extra onion, a little more Mac’s Awesome Sauce and micro greens.
  9. Serve immediately or store in the fridge for up to one month or freeze for 3 months. 


  • I love cutting this frittata into pizza slices and storing in glass containers for an easy meal prep option.
  • Click here for Mac’s Awesome Sauce Recipe 
  • Author: Ashley McCrary
  • Prep Time: 5 minutes
  • Cook Time: 30 minutes
  • Category: Breakfast/Brunch
  • Method: Oven
  • Cuisine: American