Glazed Waffle Donuts

Name: Glazed Waffle Donuts
Ingredients: 2 cups all-purpose flour; 1 1/2 teaspoons baking powder; 1 teaspoon baking soda; 1/4 teaspoon fine sea salt; 2 large eggs; 2 tablespoons granulated pure cane sugar; 1 cup sour cream; 1 cup whole milk; 1 teaspoon pure vanilla extract; 5 tablespoons unsalted butter, melted and cooled; Nonstick pan spray; Canola oil, for frying; Toasted, chopped nuts, for garnishing; Chocolate or rainbow sprinkles, for garnishing; 1/2 cup granulated pure cane sugar; 1 heaping teaspoon ground cinnamon; 2 to 4 tablespoons whole milk; 1 drop vanilla extract; 1 cup confectioners' sugar; 1/2 cup heavy cream; 4 ounces semisweet chocolate, finely chopped