Keto Beef Stroganoff

Name: Keto Beef Stroganoff
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Eastern European
Ingredients: 1 pound thinly sliced steak; 1 tablespoon extra-virgin olive oil; 3 tablespoons unsalted butter (dairy-free if needed); ½ medium yellow onion (thinly sliced (about 56 grams)); 12 ounces mushrooms (sliced); 4 cloves garlic (minced); 1 ½ teaspoons sea salt (or to taste); ½ teaspoon freshly cracked black pepper; ¼ cup beef broth; 1 tablespoon dijon mustard; 1 tablespoon Worcestershire sauce; 1 cup sour cream (dairy-free if needed)