Preheat oven to 400°F. In a 10.25-inch cast iron skillet on the stove, heat the 1⁄2 cup pizza sauce over medium heat until bubbling, about 2-3 minutes.
Grab a cast-iron or regular skillet. Pour 1/2 cup of marinara or pizza sauce into the skillet and heat it on the stove until the sauce bubbles.
Sprinkle a generous amount of shredded mozzarella cheese on top of the bubbling sauce, reserving about 1/4 cup for later.
It's time to add your favorite toppings. Whether you prefer browned sausage, ground beef, veggies, or a combination, layer them on the cheese.
Once your toppings are in place, sprinkle the remaining 1/4 cup of mozzarella cheese over the top. This will help hold everything together and create a delicious, cheesy finish.
To add flavor, sprinkle some Italian seasoning evenly across the pizza.
Place your skillet or baking dish on the top rack of the preheated oven. Bake for approximately 5 to 10 minutes, keeping an eye on it as it cooks. The mozzarella cheese should begin to bubble and turn golden brown. The exact baking time may vary depending on your oven.
Once the top is golden and bubbly, carefully remove it from the oven using oven mitts or potholders. Allow it to cool for a few minutes before serving.