Mini Almond Bundt Cakes

INGREDIENTS

• 1 large egg
• 10 tablespoons unsalted butter, room temperature, plus more for pans
• 6 tablespoons sliced almonds
• 1/3 cup coarsely chopped almonds
• 5 tablespoons packed light-brown sugar
• 1 teaspoon ground cinnamon
• 1/8 teaspoon freshly grated nutmeg
• 1 1/2 cups all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 3/4 cup granulated sugar
• 1 tablespoon pure vanilla extract
• 3/4 cup sour cream, or plain yogurt
• 2 cups sifted confectioners' sugar
• 3 to 4 tablespoons milk