Combine, shape, and grill:
1 lb. ground turkey breast
1/2 lb. ground turkey
1 tsp. kosher salt
1 tsp. freshly ground pepper

For the onions -
Grill:
4 1/2-inch thick slices red onion
1/4 cup BBQ sauce

Top burgers with:
Sliced Monterey Jack Cheese

Toast:
4 hamburger buns

Serve with:
Chipotle Mayonnaise, recipe follows
Sliced Avocado

Preheat grill to medium-high. Clean grates, then oil lightly. Combine ground turkey meats, slat, and pepper in a mixing bowl, tossing gently with your hands. Shape into four 3/4" thick patties. Coat patties with nonstick spray before grilling. Grill 4-5 minutes. Grill onions while burger cook. Brush onions with BBQ sauce and cook until soft, 8-10 minutes. Turn often, brushing with additional sauce. Top burgers with cheese after flipping. Grill to 160 degrees, 4-5 more minutes. Toast buns during the last minute of grilling. Server burgers with mayonnaise, onions, and avocado.

Chipotle Mayonnaise

Blend:
1/2 cup mayonnaise
1 tsp. sugar
1 small chipotle chile, minced
1/2 tsp. adobo sauce (from canned chipotles)
Juice of half a lime

Blend all ingredients together in a small bowl. Let sit at least 30 minutes before serving so flavors can develop.