- 1/3 cup low-calorie natural sweetener (such as Swerve®)
 - 1/4 cup almond flour
 - 1/4 cup coconut flour
 - 1 tablespoon poppy seeds
 - 1 lemon, zested
 - 1/2 teaspoon baking powder
 - 1/2 teaspoon salt
 - 1/4 teaspoon xanthan gum (optional)
 - 3 eggs
 - 3 tablespoons butter
 - 2 tablespoons sour cream
 - 1/2 teaspoon vanilla extract
 - 2 tablespoons heavy whipping cream, or more to taste
 
- Preheat oven to 350 degrees F (175 degrees C). Grease a muffin tin or line with paper muffin liners.
 - Mix sweetener, almond flour, coconut flour, poppy seeds, lemon zest, baking powder, salt, and xanthan gum together in a bowl.
 - Beat eggs in a bowl with an electric mixer on high speed until fluffy, about 2 minutes. Beat in butter, sour cream, and vanilla extract. Add sweetener mixture. Stir in cream slowly until batter is thick and smooth. Pour into prepared muffin tin.
 - Bake in the preheated oven until tops are golden, 15 to 20 minutes.