In a large skillet, brown the ground beef with the onions. Drain any excess grease.
Stir in the taco/fajita seasoning with a little bit of water, and cook until the liquid has evaporated. Add the black beans and the salsa, and stir to combine.
Arrange 6 tortillas around the edge of a large lightly greased (or parchment lined) baking sheet so that half of the tortillas are hanging off the side. Place one or two tortillas in the middle to cover any gaps.
Sprinkle one cup of the shredded cheese evenly over the tortillas, followed by the ground beef mixture, then the remaining cup of cheese and then sprinkle the sliced green onions over the top.
Place one or two tortillas over the top of the filling, then fold the tortillas that are hanging over the side of the pan toward the center, making sure that there are no gaps. Place a second baking sheet on top to keep the tortillas in place while it bakes.
Bake in a 425℉ oven for 20 minutes. Remove the top baking sheet, and bake another 10 to 15 minutes, until the tortillas are lightly browned and crispy. Let rest 10 to 15 minutes before cutting.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.Recipe Notes:
Let the quesadillas rest before slicing so the layers stay together.
Using a second baking sheet on top helps the tortillas bake evenly and get crispy.
Swap ground beef for ground turkey or shredded chicken if desired.
Serve with sour cream, guacamole, pico de gallo, or extra salsa on the side.
Leftovers reheat well in the oven or air fryer for best texture.