Whisk the eggs in a bowl and chop the bell peppers and any additional fillings.

Heat olive oil in a non-stick skillet over medium heat. Pour in the eggs and scramble until just set, then remove from heat.

On one half of each tortilla, layer scrambled eggs, cheese, bell peppers, and bacon or sausage. Fold the tortilla in half.

Wipe out the skillet and return it to medium heat. Cook each quesadilla for about 3 minutes on each side until golden brown and crispy.

Transfer to a cutting board, let rest for 2 minutes, slice into wedges, and serve hot with salsa or guacamole.