Creamy Sun-Dried Tomato Fettuccine

Ingredients (12 items)

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• ¼ cup olive oil, divided
• ¾ pound dry fettuccine pasta
• ½ cup plain fat-free Greek yogurt
• ¼ cup reduced-fat sour cream
• ½ cup sun-dried tomatoes, sliced
• 5 cloves garlic, minced
• 1 (14.5 ounce) can petite diced tomatoes, drained
• 2 tablespoons sugar, or more to taste
• 1 tablespoon tomato paste
• salt and freshly ground black pepper to taste
• 1 ½ cups baby spinach
• crushed red pepper flakes