One-Pot Tomato Basil Spinach Pasta

Ingredients

• 12 ounces spaghetti
• 1 1/2 cups diced tomatoes with liquid (of 1 15 ounce can)
• 1/2 cup sun-dried tomatoes
• 1 sweet onion, cut in julienne strips
• 4 cloves garlic, thinly slices
• 1/2 teaspoon red pepper flakes
• 1/2 tsp salt
• Fresh ground black pepper
• 2 teaspoons dried oregano leaves
• handful of basil, chopped
• handful of spinach (optional) *
• 4 1/2 cups vegetable broth
• 1 tablespoon extra virgin olive oil (optional)