The High-Heat Trick: Start baking at 400°F for the first 5 minutes before turning the oven down to 350°F. This sudden burst of hot air forces the muffin tops to puff up beautifully like a real bakery muffin. Full-Fat Sour Cream Only: Never use low-fat or watery dairy. Almond flour relies on the heavy, rich fats inside full-fat sour cream to create a soft, moist crumb that never tastes dry or crumbly. Don't Over-Mix the Batter: Fold the dry and wet ingredients together just until the flour trails disappear. Mixing too much will force the almond flour to release its oils, leaving you with heavy, flat muffins. Room Temperature Eggs: Make sure your eggs aren't freezing cold from the fridge. Cold eggs will instantly freeze your warm melted butter into hard chunks, creating a lumpy batter that bakes unevenly. The Coffee Enhancer: Don't skip the 2 tablespoons of black coffee. You will not taste any coffee notes in the finished muffin; the acids simply act as a flavor magnifier that makes the cocoa taste incredibly rich.