In medium bowl, mix egg product, garlic-and-herb seasoning and salt; set aside.
In 10-inch nonstick ovenproof skillet, heat oil over medium heat. Add onions; cook and stir 1 minute. Reduce heat to medium-low. Pour in egg mixture. Cook 6 to 9 minutes, gently lifting edges of cooked portions with spatula so that uncooked egg mixture can flow to bottom of skillet, until set.
Set oven control to broil. Top frittata with tomatoes, cheese and bacon. Broil with top 4 inches from heat 1 to 2 minutes or until cheese is melted. Top each serving with sour cream.