Combine ingredients: Crack your egg into a blender or food processor, then add the shredded mozzarella cheese, sugar-free vanilla pudding mix, and cake batter flavor. Blend on high speed for 30 to 45 seconds until the mixture is completely smooth and creamy with no visible cheese lumps.
Preheat the waffle iron: Set your waffle iron to medium-high heat and allow it to warm for 2 to 3 minutes until it's hot and ready.
Cook the waffle: Lightly grease the waffle iron with butter or cooking spray, then pour approximately half of the batter onto the center of the iron. Close the lid and cook for 3 to 4 minutes until the waffle is golden brown and crispy on the outside.
Remove and serve: Use a fork or small spatula to gently lift the waffle from the iron and place it on a plate. Repeat with remaining batter to make a second waffle. Serve immediately while warm and crispy.