Brownies with Creme de Menthe-Chocolate Chip Frosting

• In a double boiler or microwave-safe bowl, gently melt 1 1/2 sticks of butter with 4 ounces of chopped unsweetened chocolate. Stir frequently until smooth and fully combined. Set aside to cool slightly.
• In a large bowl, whisk together 4 large eggs, 1 3/4 cups sugar, and 1 1/2 teaspoons vanilla extract until the mixture is thick and pale. Gradually add the melted chocolate mixture, stirring well to combine.
• Sift in 3/4 cup all-purpose flour and gently fold it into the wet mixture using a rubber spatula. Be careful not to overmix, just fold until no streaks of flour remain.
• Stir in 1 cup semi-sweet chocolate chips evenly throughout the batter. This will give your brownies those delightful pockets of melted chocolate in every bite.
• Pour the batter into a greased 9x13 inch baking pan, spreading it evenly with a spatula. Bake in a preheated oven at 350°F (175°C) for 25-30 minutes or until a toothpick inserted near the center comes out with a few moist crumbs. Avoid overbaking to keep the brownies fudgy.
• While the brownies cool, beat 1/2 cup softened butter with 4 cups powdered sugar until fluffy. Add 3 tablespoons green creme de menthe and 3 tablespoons half-and-half, beating until smooth and spreadable. If the frosting is too thick, add the remaining tablespoon of half-and-half.
• Once the brownies are completely cool, spread the creme de menthe-chocolate chip frosting evenly over the top with an offset spatula. Sprinkle 1/2 cup mini chocolate chips over the frosting for added texture and visual appeal.
• Cut the brownies into squares and serve. These brownies are perfect for sharing or enjoying as an indulgent treat anytime.