Preheat oven to 300F / 180C
Heat 1 tbs olive oil in a pan over high heat. Add the pork carnitas and cook until the bottom is nicely browned - about 1 1/2 minutes. Do not turn, just make the bottom crispy (to keep the pulled pork as moist as possible), then remove the pulled port into a bowl. It does no matter if the top isn't heated through, it will heat in the oven.
Add the corn, black beans, 1/2 cup enchilada sauce, and 1/2 cup cheese into the bowl and mix to combine
Spread 1/2 cup of enchilada sauce on the bottom to the backing dish
Place 1/2 packed cup of filling (from step 3) into a tortilla and roll up and place in the baking dish. Repeat with remaining tortillas
Pour over the enchilada sauce, and bake for 10 minutes
Remove from oven and scatter the cheese on, then back for another 10 to 15 minutes until the cheese is bubbling and golden
Let stand for 5 minutes before serving