In a medium mixing bowl, crack the eggs and beat them together with a pinch of salt and freshly cracked black pepper until the mixture is well combined and slightly frothy.
Heat the olive oil in a non-stick skillet over medium heat. Once hot, add the diced bell peppers and sauté for about 2-3 minutes until they soften.
Pour the beaten eggs into the skillet, gently stir with a spatula, and cook until just set but still slightly creamy, roughly 3-4 minutes. Remove from heat and fold in the chopped spinach and half of the mozzarella and cheddar cheese.
Lay two tortillas flat and evenly distribute the egg mixture over them. Top each with the remaining shredded cheese.
Place the other two tortillas on top to create two quesadillas.
Return the skillet to heat and cook one quesadilla for about 2-3 minutes on each side until golden brown and crispy. Repeat with the second quesadilla.
Remove the quesadillas from the skillet and let them rest for a minute. Slice each into quarters for serving.
Serve warm quesadilla wedges with salsa for dipping and garnish with fresh cilantro leaves.
Notes
Arrange the quesadilla quarters in a fan shape on a colorful plate and drizzle some extra salsa on top for an inviting presentation.