Preheat the oven to 220°C (425°F).
Prepare the pizza dough: In a large bowl, mix 500 grams of all-purpose flour, 1 teaspoon of salt, 1 teaspoon of sugar, and 1 packet (7 grams) of instant yeast. Gradually add 300 ml of warm water and 2 tablespoons of olive oil, mixing until a soft dough forms. Knead the dough for 5-7 minutes until smooth and elastic. Cover the bowl with a damp cloth and let the dough rise for 1 hour or until doubled in size.
Prepare the pizza sauce: In a saucepan, heat 1 tablespoon of olive oil over medium heat. Add 1 finely chopped onion and 2 minced garlic cloves, and sauté until soft. Add 400 grams of crushed tomatoes, 1 teaspoon of sugar, 1 teaspoon of dried oregano, 1 teaspoon of dried basil, and salt and pepper to taste. Simmer for 15-20 minutes, stirring occasionally, until the sauce thickens.
Roll out the pizza dough on a lightly floured surface to form a 12-inch circle. Transfer the dough to a greased pizza pan or baking sheet.
Spread a thin layer of the prepared pizza sauce over the dough, leaving a small border around the edges.
Sprinkle 200 grams of grated mozzarella cheese evenly over the sauce.
Arrange 100 grams of thinly sliced pepperoni over the cheese.
Bake the pizza in the preheated oven for 12-15 minutes, or until the crust is golden brown and the cheese is bubbly and melted.
Remove the pizza from the oven, let it cool for a few minutes, and then slice and serve.