In a large bowl, combine the sourdough starter, water, flour, salt, and 25g olive oil. Stir them all with a spoon or your hands until the dough is fully combined. The dough will be sticky. That is normal.

Cover the dough with plastic wrap or a towel and let it rest for 30 minutes. This rest period allows the flour to fully absorb the water before you begin building its structure.

Lightly wet your hands with water and then gently take one side of the dough, stretch it up and fold it over the top. Turn the bowl 90 degrees and repeat this on all four sides. That's one set.

Cover the bowl and let the dough rest for 30-40 minutes.

Repeat this process 3 times, resting 30-40 minutes between each set.

After your third and final set, let the dough bulk ferment for 2-3 more hours. You are looking for the dough to look puffy, feel airy, and show visible bubbles on the surface and sides of the bowl.

In a small bowl, mix pasta sauce with Italian seasoning and garlic powder. Taste and adjust if needed, then set the sauce aside.

Grease a 9x13-inch casserole dish with 15g olive oil.

Using oiled hands, gently transfer the dough into the pan and stretch it to fit.

Drizzle olive oil over the dough and using oiled fingers, gently press dimples all over the surface.

Cover the pan loosely and let the dough rise for 1 hour. The dough should look puffy and soft but may not double in size.

Preheat your oven to 400F and then par-bake the dough for 8-10 minutes until it is slightly golden but not fully cooked. This gives the crust structure and prevents the pizza from getting a soggy bottom once the toppings go on.

Remove the par-baked crust from the oven and then spread the seasoned sauce thinly and evenly over the crust. Sprinkle shredded mozzarella cheese on top. Arrange pepperoni slices evenly over the cheese.

Bake the pizza at 400F for 12-15 minutes until the cheese is melted and slightly golden.

Remove it from the oven and let it cool for 5 minutes. Optional: drizzle a little extra olive oil for flavor.

Slice and enjoy your airy, crispy focaccia pizza.