Fudgey Mint Ice Cream Sandwiches

Ingredients

• 1 tsp vanilla extract
• 1 large egg
• 1 cup buttermilk
• 1 3/4 cups all purpose flour
• 3/4 cups dutch process cocoa powder
• ½ tsp coarse salt
• 1/2 tsp baking soda
• 1 tsp baking powder
• 1 cup sugar
• mini chocolate chips
• 1 pint 500 mL/2 cups mint chocolate chip ice cream
• 1/2 cup unsalted butter