Start by preheating your oven to 425°F. While it heats, lightly grease a medium baking dish. I usually use a mist of olive oil spray to keep things simple and mess-free.
In a mixing bowl, combine the ricotta cheese, freshly grated Parmesan, chopped spinach, red pepper flakes, Italian seasoning, and one clove of minced garlic. Stir it all up until creamy and evenly mixed—it should smell herby and cheesy already.
Lay your chicken breasts flat in the greased baking dish. Sprinkle them evenly with sea salt and cracked black pepper, then rub in the remaining minced garlic. I sometimes pat the chicken dry with a paper towel first so it holds seasoning better.
Spoon the ricotta mixture over each chicken breast. Use the back of the spoon to smooth it out so every bite of chicken gets that cheesy spinach layer. Don’t worry if some mixture drips to the sides—it’ll melt in and taste amazing.
Cover the ricotta-topped chicken generously with marinara sauce. I like to use a spoon to spread it around so it coats evenly. The sauce keeps the chicken moist while baking and blends beautifully with the cheese layer.
Pop the baking dish into the preheated oven. Bake for 20 to 25 minutes, depending on the thickness of your chicken. I always check with a meat thermometer—165°F is your magic number. In the last 3 minutes, sprinkle some extra Parmesan on top and broil it briefly for a golden finish.
Let the dish sit out for 5 minutes once baked. This resting time helps the juices redistribute so you don’t end up with dry chicken. Plus, it’s easier to serve when it’s not piping hot.