Combine the ground turkey, garlic, pureed chipotles in adobo sauce, chili powder, salt, and pepper until the seasoning is evenly distributed. Adjust the chipotle sauce or chili powder if additional heat is desired.

Allow the seasoned turkey mixture to sit for several hours or overnight.

Shape the mixture into 4 patties. Press a small indentation into the bottom side of each patty.

Place the patties on a grill over medium-high heat with the indented side facing down. Avoid pressing on the burgers while they cook.

Flip the patties after a few minutes and continue cooking until they are cooked through and no longer pink.

Serve the burgers on buns with avocado spread and nectarine salsa.