Cook the ground beef in a skillet over medium heat.
Add diced onion and minced garlic to the beef, cooking until softened.
Stir in chili powder, cumin, salt, and pepper; cook for an additional minute.
Remove from heat and mix in shredded cheese until melted and gooey.
Warm the tortillas in a separate pan until pliable.
Place a portion of the beef and cheese mixture in the center of each tortilla.
Fold the sides of the tortillas and roll them tightly into burrito shapes.
Heat oil in a deep skillet over medium-high heat, enough for frying.
Fry the chimichangas, turning until golden and crispy on all sides.
Drain on paper towels and serve warm with your favorite toppings.