Preheat oven to 350° F. Prepare 9x13 baking dish by spraying with non-stick cooking spray or lining with parchment paper; set aside.
In large bowl, add all ingredients except bell peppers and mix to combine. Scoop mixture into scooped and seeded bell pepper cavity. Place filled bell peppers into prepared baking dish and sprinkle with additional Mexican cheese blend, if desired.
Bake at 350° F for 25-30 minutes or until mixture is heated through and cheese on top is melted.
Remove from oven and top with additional queso fresco. Serve immediately.