1. Cook the breakfast sausage in a large skillet over medium heat until browned and crumbly. Drain excess grease.

2. Add the diced onion and red bell pepper to the skillet and cook until slightly softened. Stir in the beans and heat through.

3. Whisk together the eggs, milk, salt, and black pepper in a bowl.

4. Melt the butter in a nonstick skillet over medium-low heat and scramble the eggs until soft and fluffy.

5. Warm the tortillas so they are soft and easy to fold.

6. Fill each tortilla with eggs, sausage, bean mixture, cheddar cheese, Monterey Jack cheese, salsa, avocado, and cilantro.

7. Fold in the sides and roll each tortilla tightly into a burrito.

8. Toast the burritos seam-side down in a skillet until golden on both sides, then serve warm with sour cream and hot sauce.