Add neutral oil to a large pan and heat over medium low. Saute onions and bell peppers until softened, around 3-5 minutes.
Add ground beef to the pan and turn heat to medium high. Break up the meat into small chunks and cook until browned. Around 5 minutes.
Turn heat to low, add minced garlic, stir and cook for one minute. Turn off heat.
Add corn kernels, black beans, and half the can of enchilada sauce. Stir to combine.
To assemble the casserole put 2 tablespoons of the enchilada sauce at the bottom of the dish. Place two tortillas on top, overlapping in the middle.
Add ¼ cup of enchilada sauce and spread evenly.
Add half of the ground beef mixture and compact it down with the back of a large serving spoon or spatula, creating an even solid layer.
Sprinkle ⅓ of the cheese on the beef layer.
Add two more tortillas, ¼ cup enchilada sauce, remaining ground beef mixture, and another ⅓ of the cheese.
Top with remaining tortillas, press down firmly. Add the rest of the enchilada sauce and cheese.
Bake at 350 degrees for 25-30 minutes or until melted and lightly browned on top.
Top with sliced black olives and pickled jalapenos. Let rest for 10 minutes before slicing and serving.