01 - Heat a large skillet over medium-high heat. Add the ground beef and diced onion, cooking while breaking the meat apart with a spatula until evenly browned, approximately 7 minutes.
02 - Drain any excess fat from the skillet. Stir in the ketchup, yellow mustard, garlic powder, salt, and black pepper. Continue cooking for 2 more minutes, then remove from heat.
03 - Soften the flour tortillas by warming them in a dry skillet over medium heat for about 30 seconds per side, or microwave them in 15-second intervals until pliable.
04 - Lay each tortilla flat and place one slice of cheddar cheese in the center. Spoon an equal portion of the seasoned beef mixture over the cheese, then top with diced tomato, shredded lettuce, and sliced pickles.
05 - Fold the left and right sides of each tortilla inward over the filling, then roll tightly from the bottom up to form a secure wrap.
06 - Serve the wraps immediately as-is, or optionally place them seam-side down on a hot skillet for 2 minutes per side until the exterior is golden and crispy.