Preheat your oven to 400°F (204°C). Carefully slice each chicken breast horizontally, starting with the thickest part, but don’t cut all the way through—you’re creating a pocket to hold the fillings. Once sliced, season both sides with salt and pepper to bring out the natural flavor of the chicken.

Stuff each chicken pocket with two slices of juicy tomato, two slices of creamy mozzarella cheese, and a few fresh spinach leaves. Layering these ingredients inside will create a deliciously cheesy, savory filling that melts perfectly as the chicken cooks.

To keep your fillings from spilling out, carefully insert four toothpicks into the open side of the chicken breast, diagonally. This will hold everything in place while you sear and bake the chicken.

Heat 2 teaspoons of olive oil over medium-high heat in a pan. Once hot, add the stuffed chicken breasts and sear them for about 2 minutes on each side, just until golden brown. This step locks in the flavor and helps to keep the chicken moist while it bakes.

After searing, place the chicken breasts in a casserole dish. If you’re using a cast iron pan, you can simply transfer it directly to the oven, which keeps all those flavors in one pot for easy cleanup.

With your chicken in the casserole dish, make sure the oven is preheated to 400°F (204°C). This will ensure the chicken cooks evenly and gets that perfect golden finish.

Place the casserole dish in the oven and bake the chicken for about 15 minutes or until the chicken is cooked through and no longer pink in the center. The result? A juicy, perfectly cooked stuffed chicken with a delicious cheesy filling!