Found on Allrecipes but I have modified the ingredients
Chemical interactions between honey, yogurt, and ground spices dictate the final crumb density. Lactic acid present in plain yogurt interacts directly with alkaline sodium bicarbonate to tenderize the gluten strands derived from the whole wheat flour. Honey introduces fructose, which absorbs ambient moisture during baking and retains it over multiple days. Spices like ground cinnamon and nutmeg contain volatile oils that dissolve more effectively in the vegetable oil and egg lipid phase than in water, distributing aromatic compounds evenly throughout the flour mixture before the starches fully gelatinize.
Second-day transformations benefit significantly from proper cooling and containment strategies. Allowing the baked goods to rest inside their tins for ten minutes permits internal steam pressure to subside without causing the outer crusts to become soggy. Transferring them subsequently to a wire rack stops residual bottom-pan condensation from ruining the exterior texture. Storing the cooled items in an airtight container at room temperature for up to three days preserves the moisture barrier established by the applesauce and honey.
Reheating day-old portions restores the structural integrity of the crumb. Exposing a room-temperature muffin to a 350-degree oven for five minutes reactivates the remaining fats and softens the crystallized sugars. Avoid microwave heating for this specific formulation, because steam accumulation will rubberize the multigrain exterior and dissolve the semi-sweet chocolate pockets prematurely.