In a large mixing bowl, combine the all-purpose flour, salt, instant yeast, and garlic powder. Stir to evenly distribute the ingredients.
Add the warm water to the dry ingredients and mix with a wooden spoon or spatula until a sticky dough forms. Do not knead.
Fold in the shredded cheddar cheese, shredded mozzarella cheese, and grated Parmesan cheese until evenly incorporated into the dough.
Cover the bowl with plastic wrap or a clean kitchen towel and let the dough rise at room temperature for 12 to 18 hours, until it has doubled in size and is bubbly.
After the dough has risen, preheat your oven to 450°F (230°C). Place a heavy Dutch oven or oven-safe pot with a lid inside the oven to heat for 30 minutes.
While the oven and pot are heating, lightly flour a clean surface and turn the dough out onto it. Shape the dough gently into a round loaf without kneading.
Carefully remove the hot Dutch oven from the oven and brush the bottom with olive oil. Place the dough into the pot and cover with the lid.
Bake the bread covered for 30 minutes. Then remove the lid and bake for an additional 15 minutes until the crust is golden brown and crisp.
Remove the bread from the oven and transfer it to a wire rack. Let it cool for at least 30 minutes before slicing and serving.