Some people think sauces should be simmered all day. Some people are just too busy for that. 30 Minute Marinara Sauce takes a few shortcuts and the result tastes like it has been simmering since before the sun came up.
In a large skillet with a heavy lid, over medium-high heat, add two tablespoons of the olive oil, the onions, garlic, canned tomatoes and the juice, salt, ground black pepper, oregano, and dried red chilies, if using. Stir to combine.
Place the lid on the skillet and cook for 10 minutes.
Carefully remove the lid (there might be splattering) and stir the sauce. Use a potato masher or a fork to break up the tomatoes. Stir once more and place the lid back on the skillet.
Cook for 5 minutes.
Carefully remove the lid once again and stir to combine.
Once again, place the lid back on the skillet and cook for 5 more minutes.
Turn off the heat. Remove lid and stir sauce. Taste for seasoning and add more salt if needed.
Pour in the remaining tablespoon of olive oil and stir into hot sauce. Serve immediately.