Brownies and bars are a category unto themselves—completely adaptable and as simple as pouring batter into a pan, with chewy edges and tender centers. Just about any drop cookie dough can be pressed into a pan and baked as a bar cookie; to make sure it’s the right consistency, melt the butter and add an extra egg yolk. It doesn’t get much better than that, but you can also top the finished bars with anything you’d add to a cookie—Chocolate Ganache, Caramel Sauce, Fruit Jam, or Chocolate Buttercream, for starters.