Heat 1 tablespoon olive oil in a large skillet over medium-high heat. Add the onions and cook until soft and translucent, about 3-4 minutes.
Add the jalapeño peppers, black beans and taco seasoning, and cook until warmed through, mashing the beans with the back of a spatula, for 2 more minutes.
Place the mini tortillas on a grill pan heated with the remaining tablespoon of olive oil. Divide the mixture into half of each of the mini tortillas. Add cheese on top and fold the tortillas over.
Cook the tortillas on medium-high heat until the crust is crispy and the cheese has melted, about 2 minutes per side.
Serve with salsa and/or sour cream, if desired.
Video
Notes
Storage: Store any leftovers in an airtight container. They will last about 3-4 days in the fridge. Reheat them in the oven or toaster oven, but they won't be as good as fresh out of the grill pan.Freezing Instructions: You can also freeze the cheese quesadillas, but I recommend freezing before cooking. Lay them flat on a baking sheet until firm. Then transfer to a freezer bag or airtight container for up to 2 months. You can cook them from frozen by placing them on the heated skillet and cooking for 2-3 minutes per side until heated through. Make Ahead Tips: You can make the filling up to 2-3 days in advance. I recommend also mixing the cheese with the filling if doing so. This will minimize any prep when it's time to cook them. Substitutes: For best results, follow the recipe as is. However here are some common substitutes that would work well in this recipe.
Instead black beans, you can use refried beans.
Instead of jalapeño peppers, you can use green peppers or skip them.