Step 1

Preheat the oven to 425 degrees F (220 degrees C). Lightly grease a large rimmed baking sheet.

Step 2

Place chicken on the prepared baking sheet and sprinkle with garlic salt and black pepper. Spread pesto over chicken and top with tomatoes and cheese.

Step 3

Toss broccoli and oil together in a bowl. Place broccoli around chicken on the baking sheet. Sprinkle salt and pepper on top.

Step 4

Bake in the preheated oven until broccoli is tender and chicken is no longer pink in the center, 15 to 20 minutes. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).