Heat the olive oil in a large skillet over medium heat. Once hot, add the ground beef and cook, breaking it apart with a spatula. Cook until the beef is browned and fully cooked through (about 5-7 minutes). Drain any excess fat.

Stir in the chopped onion and minced garlic. Cook for 2-3 minutes until the onion softens and becomes translucent. Then, sprinkle in the taco seasoning and pour in the water. Stir everything together until the beef is well-coated with the seasoning. Let it simmer for a few minutes until the flavors meld together.

While the beef mixture is simmering, warm your flour tortillas in a dry skillet or microwave for about 15-20 seconds until soft and pliable. This makes them easier to roll and adds a nice warmth to the burritos.

Once your tortillas are warmed, place them on a flat surface. Spoon a generous amount of the seasoned beef mixture into the center of each tortilla. Top with shredded cheddar cheese, a dollop of sour cream, and a spoonful of salsa or guacamole if desired.

Fold in the sides of the tortilla, then roll it up tightly from the bottom to the top, securing the filling inside. Repeat with the remaining tortillas and filling.

Slice the burritos in half if you prefer smaller portions or serve them whole. Enjoy your beef burritos immediately with extra salsa, sour cream, or guacamole on the side!