In a large skillet, cook the ground beef over medium heat until browned; drain excess fat.
Add the chopped onion and green bell pepper to the skillet and cook until tender.
Stir in the taco seasoning mix and cook for another 2 minutes.
In a large bowl, combine the cooked beef mixture, thawed hashbrowns, sour cream, cream of mushroom soup, and half of the shredded cheddar cheese; mix well.
Season with salt and pepper to taste.
Transfer the mixture to a greased 9x13 inch baking dish and sprinkle the remaining cheddar cheese on top.
Bake in the preheated oven for 35 minutes or until the cheese is melted and bubbly.
Notes
Serve warm and enjoy with your favorite toppings like sour cream, salsa, or jalapenos.