Sauté Vegetables and Beef: Melt butter in a medium skillet over medium heat. Add asparagus, bell pepper, and onion. Cook for about 5 minutes until tender. Add beef sausage or ham and cook 2 more minutes until heated through.
Prepare Egg Mixture: In a bowl, whisk eggs with salt and pepper until smooth.
Cook Omelet: Pour eggs over the vegetable-beef mixture. Cook undisturbed for 2 minutes, lifting edges to let uncooked eggs flow underneath.
Add Cheese: Sprinkle Provolone cheese evenly over the omelet when eggs are mostly set.
Fold and Serve: Fold omelet in half and cook 1 more minute to melt the cheese. Serve warm.
Serving and Storage Tips:
