In a large skillet or saucepan, heat the olive oil over medium heat.

Add the minced garlic and chopped onion, and sauté until translucent and fragrant, about 3-5 minutes.

Add the can of diced or crushed tomatoes to the skillet.

Season with salt, black pepper, sugar (if using), dried oregano, dried basil, and red pepper flakes (if using).

Stir well to combine.

Reduce the heat to low and let the sauce simmer for about 15-20 minutes, stirring occasionally, until it thickens to your desired consistency.

Taste and adjust the seasoning if needed.

If you prefer a smoother sauce, you can use an immersion blender to blend the sauce to your desired consistency.

Let the sauce cool before spreading it on your pizza dough.

Garnish with fresh basil leaves if desired.