Danish Creamery : Brownie Bites with Mint Buttercream

Ingredients

• 2 sticks (1 cup) Unsalted Danish Creamery Butter
• 1 ¼ cups granulated sugar
• 1 cup light brown sugar
• 1 ½ cups cocoa powder
• 1 teaspoon Kosher salt
• 1 Tablespoon vanilla extract
• 4 large eggs, room temperature
• ¾ cup all-purpose flour
• 1 cup Danish salted butter, cubed
• 3 ½ cups (450 g) powdered sugar, sifted
• ¾ teaspoon peppermint extract
• 1 teaspoon boiling water
• green food coloring, optional