Heat a large skillet with oil. Add onions, peppers and diced jalapeño, corn and saute for couple more minutes. Add the black beans, fire-roasted tomatoes, lime juice and then the spices. Stir to combine. Remove from heat. Taste and adjust salt.
Add the cooked brown rice and mix well. Then add 1 cup shredded cheddar cheese and mix it.
Preheat oven to 400º F. Grease the baking dish. Transfer the rice and veggies mixture in the baking dish. Sprinkle the remaining cheddar cheese and Mexican blend cheese on the top.
Bake in the center of the oven for 12-15 minutes, until the cheese is bubbling.
Leave a few minutes under broil if desired until lightly golden. Garnish with cilantro and sliced jalapeños. Cut into squares and serve!