Tasting the rainbow is better with frosting and sprinkles.
1/3 cup + 1 tablespoon buttermilk
3 tablespoons unsalted butter, melted
1 cup all-purpose flour
1 teaspoon baking powder
1/4 teaspoon salt
1/4 cup sugar
2 tablespoons honey
1 large egg
1/2 teaspoon vanilla extract
Pink, orange, yellow, green, blue and purple food coloring
3 tablespoons whipping cream
1 cup confectioner's sugar
Whisk together the flour, baking powder and salt in a small bowl and set aside. In a large bowl, combine the butter, sugar, honey, egg and vanilla extract. Add the buttermilk and mix until combined. Add the dry ingredients and milk until just combined - make sure not to overmix. Divide the mixture into 6 bowls and dye them the colours of the rainbow.
Spoon the batter into a greased doughnut pan, creating a rainbow pattern. Bake at 400F for 7 minutes. Cool for 1 minute in the pan, then flip the pan over to remove the doughnuts and cool completely on a wire rack.
Make the glaze: Whisk together the whipping cream and the confectioner's sugar and whisk until fully combined. Dunk each doughnut into the glaze and return to the wire rack. Top with rainbow sprinkles and enjoy!