In a large skillet, heat oil over medium-high heat. Add onion; cook and stir 6-8 minutes or until tender. Stir in tomato paste, garlic, paprika, sugar and pepper flakes; cook 2 minutes longer., Stir in tomatoes; bring to a boil. Reduce heat to maintain a simmer. With the back of a spoon, make four wells in sauce. Break an egg into each well. Sprinkle with cheese; cook, covered, 8-10 minutes or until egg whites are completely set and yolks begin to thicken but are not hard. Sprinkle with parsley. If desired, serve with polenta.