Easy Marinara Sauce

3 tablespoons olive oil

1 Spanish onion, chopped

¼ green bell pepper, chopped

4 cloves garlic, finely chopped

2 tablespoons brown sugar

2 teaspoons Italian seasoning

2 teaspoons salt

1 teaspoon dried oregano

1 teaspoon dried basil

½ teaspoon ground black pepper

¼ teaspoon red pepper flakes

4 (14.5 ounce) cans diced tomatoes

1 (14 ounce) can tomato sauce

2 (6 ounce) cans tomato paste

1 cup white wine

Heat olive oil in a large pot over medium heat; cook and stir onion, green bell pepper, and garlic until onion is translucent, 5 to 10 minutes. Add brown sugar, Italian seasoning, salt, oregano, basil, black pepper, and red pepper flakes; cook and stir until brown sugar dissolves and seasoning is fragrant, 1 to 2 minutes.

Stir tomatoes, tomato sauce, tomato paste, and white wine into the seasoned onion mixture; bring to a boil for 10 minutes. Reduce heat and simmer, stirring occasionally, until flavors have blended, at least 30 minutes.