Look at the labels to find the marinara sauce with the least carbohydrate. Most will be between 9 and 14 grams of carbohydrate per 1/2-cup serving, depending on the amount of sugar that is added. You can also use a tomato pasta sauce in place of the marinara.
Melt butter in a large nonstick skillet with sloped sides over medium-high heat. Add onion and garlic, and sauté until tender.
Combine egg substitute and next 4 ingredients; add onion mixture, stirring well. Pour egg mixture into pan. Cover; cook over medium-low heat 10 minutes or until mixture is set. Remove from heat; sprinkle with cheese. Cover; let stand 5 minutes or until cheese melts. Cut into 8 wedges, and serve with warm marinara sauce.