Lay the tortilla flat on a large pan or griddle. Spread shredded cheese evenly over one half of the tortilla, then top with chicken, jalapenos, and red onion.
Fold the empty half of the tortilla over the fillings and press down with a spatula.
Cook overmedium-low heat until the bottom is crisped to a golden-brown, about 8-10 minutes. Then carefully flip and crisp the other side, about 3-5 minutes.
Transfer cooked quesadilla to a cutting board and slice into 4 equal triangles. Serve immediately with a side of chips and salsa.
Notes
Salsa-Marinated Chicken: We usually haveleftover salsa marinated chicken in our fridge since it makes for easy lunches. But any Mexican-seasoned chicken or plain grilled chicken tastes great in a quesadilla if you don't have salsa-marinated chicken lying around!Serving suggestions: Try our homemade guacamole with this quesadilla if you're feeling extra fancy!Doubling the recipe: You can easily double this recipe by making one "full-size" quesadilla, then cutting it into 8 triangles. Spread the filling over an entire tortilla (instead of half), then top it with the second tortilla (instead of folding the tortilla), and continue with the recipe as normal.