Cut the peppers in half, remove the ribs and seeds and place in a 9x13 inch baking dish. Use 1 tablespoon of the oil to rub all over the peppers.
Heat the remaining oil in a large sauté pan over medium heat and sauté the onions for 3 minutes.
Add the cooked rice, beans, corn, tomatoes, lime juice, cumin, paprika and salt and stir together to combine. Cook the mixture for 5 minutes or until liquid evaporates. Add 1/2 cup grated cheese.
Divide the mixture between the pepper halves and top with remaining cheese.
Cover the dish with foil and bake for 30 minutes. Uncover for an additional 10 minutes or until peppers are fork tender and cheese is melted.
Notes
Meal Prep Friendly: Make the filling a day in advance so you just have to stuff and bake when you're ready to eat.
Want softer peppers? Pre-bake the empty pepper halves for 10 minutes while you prepare the filling. This cuts down on the final baking time too.
Storage: These keep well in the fridge and reheat beautifully for lunches! Store any leftover stuffed peppers in an airtight container in the refrigerator for up to 4 days. To reheat, bake in the oven until warmed through.
To Freeze: There are two ways to freeze stuffed peppers. You can assemble them unbaked, freeze, and then add about 15 extra minutes to the baking time when you're ready to cook. Or you can bake them first, let them cool, and then freeze. When you're ready to enjoy, just pop them back in the oven until heated through.