Creme Egg Cupcakes - Cupcake Fanatic

Ingredients

• 2 cups (280g) all-purpose flour
• 1 cup (85g) unsweetened cocoa powder
• 2 cups (400g) granulated sugar
• 1 tsp (5g) baking soda
• 1 tsp (5g) baking powder
• ½ tsp (3g) kosher or sea salt
• ½ cup (120mL) vegetable oil
• 2 large eggs
• 2 tsp vanilla extract
• 1 cup (250g) sour cream
• 1 cup (237mL) coffee, at room temperature
• ½ cup (120mL) light corn syrup
• 4 Tbsp (1/2 stick) unsalted butter, at room temperature
• 1 tsp vanilla extract
• ¼ tsp salt
• 1½ cups (150g) powdered sugar
• 1-2 drops yellow food coloring
• 12 Tbsp (1½ sticks) unsalted butter
• 3½ cups (350g) powdered sugar
• ¼ cup milk