Whole Wheat Blueberry Muffins

Bahan-bahan (10 porsi)

• 1 egg yolk
• 1 egg
• 1/2 cup milk
• 1/2 cup maple syrup, honey, or a combination
• 1 teaspoon vanilla
• 7 tablespoons salted butter, melted
• 1 cup whole wheat flour
• 1/2 cup white flour
• 2 teaspoons baking powder
• a pinch of salt
• 2 cups frozen wild blueberries
• 3 tablespoons butter
• 2 tablespoons milk
• 1 cup powdered sugar