Making marinara sauce from scratch is SUPER easy. It tastes way better than any store-bought version, plus you can customize it to your taste however you'd like!
Heat the oil in a medium-sized pot on medium-high heat. Add the chopped onions and sauté for 5 minutes until translucent. Add the garlic and sauté for 60 seconds more.
Add the canned crushed tomatoes, spices, and parsley. Bring the mixture to a boil, then reduce the heat and simmer partially covered for 15-20 minutes, or until slightly thickened.
Remove the sauce from the heat. Stir in the chopped basil. Taste the sauce and adjust, adding a pinch of sugar to cut the acidity if needed. Optional: using an immersion blender, or heat safe blender, blend your sauce until smooth.