15 Brownies and Bar Cookies Perfect for Last-Minute Baking

Richer than a cookie but more portable than cake, brownies and bar cookies make for the ultimate convenient, satisfying dessert (or snack) that's appropriate at any time of the day. From classic nut-studded chocolate brownies to tangy lemon bars on a shortbread crust, these 15 simple treats show off the versatility of the beloved bar.