Creating Sicilian square pizza can be straightforward if you follow these simple steps:

1. Activate Yeast: In a small bowl, combine warm water, sugar, and yeast. Let it sit for about 5-10 minutes until frothy.
2. Mix Dry Ingredients: In a large bowl, whisk together flour and salt.
3. Combine Mixtures: Create a well in the center of the flour and pour in the yeast mixture and olive oil. Stir until a dough forms.
4. Knead Dough: Transfer the dough to a floured surface and knead for about 5-7 minutes until smooth and elastic.
5. First Rise: Place the dough in a greased bowl, cover it with a damp cloth, and let it rise in a warm place for 1 hour or until doubled in size.
6. Prepare Baking Pan: Grease a 12×18-inch baking sheet or pan with olive oil.
7. Shape Dough: Once risen, punch the dough down and stretch it gently to fit the pan. Allow it to rest for another 30 minutes.
8. Preheat Oven: Preheat your oven to 475°F (245°C).
9. Add Sauce: Spread marinara sauce evenly over the dough, leaving a small border around the edges.
10. Layer Cheese: Sprinkle mozzarella cheese generously over the sauce, followed by Parmesan cheese.
11. Add Toppings: If using additional toppings, add them now.
12. Bake: Place the pan in the preheated oven and bake for 25-30 minutes or until golden brown and bubbly.
13. Cool and Slice: Remove from the oven and let it cool slightly before slicing into square pieces.
14. Garnish: Top with fresh basil leaves for a burst of flavor and color.

Following these steps will guide you in creating a delicious Sicilian square pizza that will impress your family and friends.