Bacon, Ham and Cheese Omelet

Name: Bacon, Ham and Cheese Omelet
Cuisine: European, American
Ingredients: INGREDIENTS; 4 tablespoons butter, divided; ½ cup mushrooms, sliced; ¼ cup red onion, sliced; ¼ cup HORMEL® CURE 81® Classic Boneless Ham, coarsely chopped; 2 tablespoons HORMEL® Real Bacon Pieces; ½ cup fresh spinach, chopped; 3 large eggs, lightly beaten; ¼ teaspoon kosher salt; ¼ cup shredded Cheddar cheese