Heat oven to 375° F. Lightly spray a 9"x13" baking dish.
In a large skillet, cook the bacon. Remove to paper towel to drain. Reserve the fat.
Chop the bacon into bite-sized pieces and set aside.
Add 2 Tbsp of the bacon fat to the same skillet and cook the onion and jalapeño over medium heat. Use a little more of the bacon fat, if needed.
Add the garlic and cook for 1 minute, stirring frequently.
Add the hominy, salt, pepper, and taco seasoning. Stir.
Remove from the heat and add 2 cups of the cheese and 1/2 cup of the green onions. Stir to combine.
Add the half and half. Stir.
Mix in 3/4 of the chopped bacon.
Pour into the lightly sprayed 9"x13" baking dish.
Top the casserole with the remaining cheese, bacon, and green onions.
Bake uncovered for 25-35 minutes, or until hot and bubbly.
Serve hot as a main or a side dish.