Step 1

Preheat the oven to 400ºF.

Step 2

Toss the baby potatoes with one tablespoon pesto in a large bowl. Arrange in a single layer on 1/3 of a large rimmed sheet pan. Cook for 15 minutes.

Step 3

Pat the chicken breasts dry and brush with about 1 teaspoon pesto per chicken breast. Toss the broccoli rabe with the olive oil and kosher salt in a large bowl. Add the chicken breasts and broccoli rabe to the sheet pan. Cook for 15 minutes more, then stir the broccoli rabe and potatoes.

Step 4

Continue to cook for about 10 to 15 minutes more, until a thermometer inserted into the thickest part of the largest chicken breast registers 165ºF.

Step 5

Remove from the oven. Brush the chicken and potatoes with additional pesto and sprinkle the broccoli rabe with flaky sea salt. If desired, add mozzarella balls to each serving and serve immediately.