01 - Preheat the grill or grill pan to medium-high heat.
02 - Rub chicken breasts with olive oil, salt, ground black pepper, and garlic powder. Grill for 5 to 6 minutes per side, until the internal temperature reaches 165°F. Remove from the grill, let rest for 5 minutes, then slice thinly.
03 - In a mixing bowl, whisk together Dijon mustard, honey, Greek yogurt, and lemon juice. Season with salt and black pepper to taste.
04 - Warm flour tortillas in a dry skillet or microwave until soft and pliable.
05 - Lay the tortillas flat. Spread 1 tablespoon of honey mustard sauce down the center of each tortilla.
06 - Layer the sliced grilled chicken, mixed microgreens, cucumber, avocado, and red onion on top of the sauce.
07 - Drizzle additional honey mustard sauce over the assembled ingredients, if desired.
08 - Fold in the sides of each tortilla and roll up tightly to enclose the filling. Slice in half and serve immediately.