Preheat oven to 400 degrees F and line a baking sheet with a silicone mat or parchment paper.
Toast bagels in toaster oven.
Spread each toasted bagel half with desired amount of cream cheese, then place on prepared baking sheet and set aside.
Heat a large nonstick skillet over medium heat.
Cook sausage, onion, and peppers, breaking up the sausage as you go, until the sausage has cooked through and the veggies are tender. About 5-10 minutes.
Season with salt and pepper, to taste and remove from skillet.
In the same skillet, melt butter over medium heat.
Pour in whisked eggs, stirring occasionally with a rubber spatula, until cooked to your liking. Season with salt and pepper, to taste.
Spoon egg mixture onto the prepared bagel halves, then spoon the sausage mixture on top of the eggs.
Top each bagel half with shredded mozzarella and cheddar.
Bake in preheated oven until cheese is melted, about 10 minutes.
Remove from oven, garnish with optional toppings: hot sauce, cilantro, and crumbled feta, and serve immediately!
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