Step 1

Preheat pellet grill to 400°F.

Step 2

Coat chicken breasts with olive oil.

Step 3

Season chicken with salt, garlic powder, and onion powder.

Step 4

Grill chicken over medium-high heat for about 3 minutes per side, turning once.

Step 5

Transfer chicken to a shallow baking dish.

Step 6

Slice tomatoes and mozzarella into 1/4-inch thick slices.

Step 7

Layer chicken with tomato slices, followed by mozzarella.

Step 8

Return dish to grill; cook for 10 minutes.

Step 9

Check chicken's internal temperature with a probe; it's done at 165°F.

Step 10

Remove chicken from grill; let rest.

Step 11

Chop basil leaves.

Step 12

Drizzle chicken with balsamic reduction.

Step 13

Garnish with chopped basil. Serve.