01 - In a large mixing bowl, whisk together the flour, instant yeast, sugar, and salt. Pour in the warm water and olive oil, then stir until a slightly sticky dough forms and no dry flour remains.
02 - Turn the dough onto a lightly floured surface and knead for 5 to 8 minutes until smooth and elastic. Transfer to an oiled bowl, cover with a damp towel or plastic wrap, and let rise in a warm spot until doubled in size, about 1 hour.
03 - Preheat the oven to 430°F (220°C). Generously oil a 9x13-inch baking pan, making sure to coat the bottom and sides.
04 - Transfer the risen dough into the prepared pan and stretch it gently to fill the corners. Use your fingertips to press deep dimples across the entire surface. Drizzle generously with olive oil and let the dough rest for another 20 minutes to puff slightly.
05 - Spread the pizza sauce evenly over the dough, leaving a small border around the edges. Layer on the shredded mozzarella, pepperoni slices, crumbled Italian sausage, sliced red onion, green bell pepper strips, and black olives. Finish with an even sprinkle of grated Parmesan and dried oregano.
06 - Bake on the center rack for 20 to 25 minutes until the crust is golden brown and the cheese is melted and bubbly.
07 - Remove from the oven and let cool for 5 minutes. Scatter fresh basil leaves over the top if desired, then slice into squares and serve warm.