Meanwhile, heat a large skillet over medium-high heat. In a large skillet, saute zucchini, yellow squash, onion and garlic in olive oil until vegetables are … Continue to … Add garlic and saute until slightly yellow in color. Ingredients 2 medium onions, chopped 2 tablespoons butter 2 tablespoons canola oil 8 large tomatoes, chopped 2 medium zucchini, cut into 1/2-inch cubes 4 garlic cloves, minced 2 teaspoons dried oregano 1 teaspoon salt 1/2 teaspoon pepper Hot cooked pasta Add the oil, pepper flakes, garlic, shallots and 1/2 teaspoon salt. squash is caramelized and golden brown, 5-8 minutes. Add seasonings: 1/2 teaspoon of each -- salt, pepper, and paprika. ZUCCHINI AND SQUASH: Add the shredded zucchini and squash. Toss well to coat in the flavors and cook another 3 minutes. Cook, stirring often, for 2 minutes. Stir over medium-high heat for 1 minute. Using a potato masher, mash down the zucchini until it becomes a chunky sauce Add the zucchini and yellow squash and season with 1 teaspoon salt. HEAT olive oil in a large skillet over medium heat.