Robin's Egg Chocolate Cake for Easter and Spring Baking - Quickie Recipe

Ingredients

• 1 3/4 cups (220 g) all-purpose flour
• 3/4 cup (65 g) unsweetened cocoa powder
• 1 3/4 cups (350 g) granulated sugar
• 1 1/2 teaspoons baking soda
• 1 teaspoon baking powder
• 1 teaspoon fine salt
• 2 large eggs, room temperature
• 1 cup (240 ml) buttermilk, room temperature
• 1/2 cup (120 ml) neutral oil
• 2 teaspoons vanilla extract
• 1 cup (240 ml) hot coffee or hot water
• 1 1/2 cups (340 g) unsalted butter, softened
• 5 cups (600 g) powdered sugar, sifted if lumpy
• 1/4 cup (60 ml) heavy cream, plus more as needed
• 1/4 teaspoon fine salt
• Sky blue gel food coloring, added a little at a time
• 1 tablespoon unsweetened cocoa powder
• 1 to 1 1/2 tablespoons vanilla extract or water
• 1 cup (85 g) chocolate curls or shaved chocolate
• 1 cup candy-coated chocolate eggs