Heat oil in a skillet or saucepan. Add the ground meat and cook until browned. Add the chopped onion and chopped green bell pepper, and sauté until softened.

Season with salt, black pepper, garlic powder, and oregano. Add 2 tablespoons of Mexican salsa and 1 tablespoon of mild tomato sauce. Stir to combine.

Transfer everything to a baking dish. Sprinkle the shredded cheese on top and bake in the oven for 10 minutes. Top with nachos and jalapeños, then serve.