In a large skillet, cook the ground beef over medium heat until browned, about 6-8 minutes. Drain any excess fat.
Add the refried beans and taco seasoning to the beef, stirring to combine. Cook for an additional 3-5 minutes.
Place a spoonful of the beef and bean mixture onto each tortilla, sprinkle with cheddar cheese, and roll them up tightly.
In a large skillet, heat the oil over medium heat. Carefully place the rolled tortillas in the oil and fry until golden brown on all sides, about 2-3 minutes per side.
Remove chimichangas from the oil and drain on paper towels. Serve with sour cream and salsa.