preheat oven to 400 degrees

place the chicken breasts on a cutting board, using a sharp knife, cut slits across the chicken breast about 3/4 of the way through being careful not to cut all the way through

depending on the size of your chicken breast, you're going to want around 6 to 8 slits per chicken breast

stuff each slit with a slice of mozzarella cheese, half a grape tomato and a basil leaf

place the chicken breasts in a baking dish that has been coated a little olive oil

brush each chicken breast with olive oil

sprinkle each chicken breast with salt, pepper and italian seasoning

bake for 30 minutes