Saucy Spaghetti Bake

Ingredients

• 16 oz spaghetti (uncooked (see note))
• 1 jar 22 fl oz/ 650 mL prepared tomato sauce
• 3 1/2 cup(s) water
• 1/4 cup(s) tomato paste
• 1 yellow onion (chopped)
• 4 clove(s) garlic (minced or pressed)
• 1 teaspoon(s) dried basil
• 1 teaspoon(s) dried oregano
• 3/4 teaspoon(s) salt
• 1/4 teaspoon(s) black pepper
• 1/4 teaspoon(s) crushed red pepper flakes ((optional))
• 1/4 cup(s) vegan butter
• 2 clove(s) garlic (minced or pressed)
• 1/4 cup(s) all-purpose flour
• 1 1/2 cup(s) plant-based milk ((such as oat or soy))
• 1 tablespoon(s) nutritional yeast
• 1/2 teaspoon(s) salt
• 1/2 teaspoon(s) dried basil leaves
• 1/2 teaspoon(s) onion powder