Cook the broccoli until tender, then chop it very finely. Grate the garlic, the parmesan, and the mozzarella. Having everything ready makes the mixing step quick and stress-free.
Set your oven to 350°F. Spray the muffin pan generously with non-stick spray, including the tops of the pan. Set it aside while you make the chicken mixture.
Add the ground chicken, broccoli, parmesan, tomato sauce, garlic, oregano, and basil to a large bowl. Mix with clean hands until everything is well combined. Stop as soon as it looks even so the texture stays tender.
Divide the mixture evenly among the 12 muffin cups. An ice cream scoop makes this fast and keeps the sizes equal. Press each one down gently so it holds its shape while baking.
Spread a thin layer of tomato sauce over each muffin with a small spoon or brush. Sprinkle a generous pinch of shredded mozzarella on top. This is where the cheesy, pizza-style magic begins.
Slide the pan into the oven and bake for 15 to 18 minutes. The muffins are ready when the center reaches 165°F on a thermometer. The cheese should look melted and bubbly.
For a golden top, switch the oven to broil for 1 to 2 minutes. Stay close and watch carefully, because cheese browns fast. Let the muffins cool for a couple of minutes, then garnish and serve.