In a large skillet, heat some cooking oil or melt butter over medium heat. Add the diced onion and bell pepper, and sauté until they become soft and translucent.

In a separate bowl, whisk the eggs until well beaten. Pour the eggs into the skillet with the onions and bell peppers. Cook, stirring occasionally, until the eggs are scrambled and cooked to your desired consistency.

Season the scrambled eggs with salt and pepper to taste. Remove from heat and set aside.

Warm the tortillas in a microwave or on a griddle until they are soft and pliable.

Place a tortilla on a flat surface and spoon some of the scrambled eggs onto the center of the tortilla. Add a portion of the cooked and chopped bacon or sausage on top of the eggs.

Sprinkle shredded cheddar cheese, diced tomatoes, and chopped cilantro (if using) over the eggs and bacon.

Fold the sides of the tortilla over the filling, then roll it up tightly from the bottom to create a burrito shape. Repeat this process with the remaining tortillas and filling ingredients.

Warm the assembled breakfast burritos in a skillet or on a griddle for a few minutes to melt the cheese and heat them through.

Finally, serve the breakfast burritos with your choice of toppings such as salsa, sour cream, avocado slices, and hot sauce.