Overmixing develops gluten and dries out the batter therefore only mix it until ingredients are combined.
Buttermilk and yogurt help tenderize the batter and retain moisture to keep the cake moist.
Whole Oreo cookies will result in crunchy and dry base for cake therefore crush the cookies, mix with butter, and soak in milk.
Always grease and line the pan with parchment paper to prevent cake from sticking.
Bake at a consistent 160–175°C and avoid overheating the cake as it can dry it out.
Brush the cake layers with a bit of chocolate milk or sugar syrup before frosting for added moistness.
Let the cake cool down before applying the frosting so the frosting won’t melt down.