Oat Flour (1.5 cups): This provides a tender, slightly nutty base. Oat flour is lower in calories than traditional wheat flour and is packed with soluble fiber to keep you feeling full and energized.Almond Flour (0.5 cups): A touch of finely ground blanched almond flour adds essential healthy fats that replicate the rich mouthfeel of butter, effectively preventing the cake from becoming too dry during the baking process.Zero-Calorie Sweetener (3/4 cup): A granulated monk fruit and erythritol blend works absolute wonders here. It measures 1:1 like traditional sugar, browns slightly in the oven, and leaves virtually no bitter chemical aftertaste.Unsweetened Applesauce (1/2 cup): This is the ultimate baking fat replacer. It injects vital moisture and a subtle underlying sweetness into the crumb without the heavy caloric load of canola oil or melted butter.Non-Fat Greek Yogurt (1/2 cup): Adding yogurt provides a slight, pleasant tang similar to buttermilk, while simultaneously boosting the protein content and creating a rich, velvety texture in the wet batter.Egg Whites (3 large): Using egg whites instead of whole eggs completely cuts out the cholesterol and fat from the yolk while providing the necessary protein structure and lift to keep the cake airy.Unsweetened Almond Milk (1/3 cup): This thins the batter to the perfect pourable consistency for just 10 calories per cup.Vanilla Extract (2 teaspoons): Do not skimp on this ingredient. A high-quality, pure vanilla extract provides the deep, aromatic profile that tricks the palate into perceiving richness and decadence.Baking Powder (2 teaspoons) and Baking Soda (1/2 teaspoon): These are the critical leavening agents responsible for a light, airy rise in the absence of traditional creaming methods.Sea Salt (1/2 teaspoon): Essential for balancing the sweetness and sharply enhancing the vanilla notes.