In a medium mixing bowl, combine the shredded cheese, diced red bell peppers, corn, chopped cilantro, and ground cumin. Toss everything together until the vegetables are evenly distributed through the cheese. This ensures that every bite of your tree has a pop of color and flavor.
Stack your green tortillas and use a sharp knife or a pizza cutter to cut them into large triangles. You can do this by cutting the round tortilla into six or eight wedges, just like a pizza. Each wedge will serve as a single Christmas tree. For a more defined look, you can cut a small notch at the bottom of the wide end to create a trunk, or simply use a small rectangular piece of leftover tortilla as a separate trunk during assembly.
Take one tortilla triangle and spread a generous layer of the cheese and vegetable mixture over the surface. Place a second tortilla triangle directly on top to create a sandwich. Repeat this process with the remaining tortilla pieces until all your trees are assembled and ready for the pan.
Heat a large skillet or griddle over medium heat and add a small amount of butter or oil. Carefully place the quesadilla trees into the pan, being careful not to overcrowd them. Cook for about 2 to 3 minutes on each side, or until the tortilla is slightly crisp and the cheese inside has completely melted. Turn them gently with a spatula to keep the filling from falling out.
Remove the quesadillas from the heat and let them sit for a minute to let the cheese set. Transfer them to a serving platter. Use a spoon or a piping bag to create a “garland” of sour cream across the trees. You can place small dots of salsa or extra bits of bell pepper as ornaments and add a small dollop of guacamole at the top to represent the star.
