Preheat the oven to 350℉. Spray a 9x13-inch baking dish (one that's at least 2 inches deep) with vegetable oil spray.
Put the bacon slices in a cold skillet. Turn the heat to medium-low and cook the bacon for 3 minutes on one side. Turn the bacon and cook on the other side to desired doneness. Remove the bacon with a slotted spoon and drain on paper towels.
When cool enough to handle, crumble the bacon with your fingers and set aside.
Carefully pour off all but 2 to 3 Tbsp of the bacon drippings. Return the skillet to the stovetop and stir in the onion. Cook over medium heat until the onion is tender, about 5 minutes.
Pour in the hominy liquid and jalapeno liquid and cook until reduced by about one-half, about 5 minutes.
Add the hominy and jalapenos and heat through.
Stir in half of the crumbled bacon and half of the cheese.
Spoon into the prepared baking dish. Scatter the remaining bacon and cheese over the hominy.
Bake for 25 minutes, until the cheese on top melts and the hominy mixture is bubbly.
Let sit for 5 minutes before serving.