In a 10-inch cast-iron skillet, cook the beef and onion over medium-high heat until the beef is no longer pink. Stir in taco seasoning, chili powder, and tomato sauce. Bring to a boil and reduce heat to low. Simmer 3-5 minutes, or until slightly thickened.
Stir in tomatoes, beans, and corn. Simmer an additional 2 minutes. Remove from heat and top with shredded cheese. Then sprinkle the fritos over top.
Bake 10-15 minutes, or until cheese is melted and bubbly.
Top with your favorite toppings to serve.
Notes
Storage: Store in an airtight container in the refrigerator up to 4 days. Freezer instructions: Freeze the cooked beef mixture in airtight container up to 3 months. When ready to eat, place in the refrigerator to thaw overnight and assemble the pie with Fritos right before cooking.