Sugar-Crusted Brownie Sundaes with Whiskey-Walnut Caramel Sauce

This recipe makes a big batch of brownie cups, perfect for creating sundaes. I love having a big bag of these stored in the freezer for last-minute desserts or special after-school snacks. These brownies are free of extra nuts, chocolate chips, or other chunky candy additions, highlighting their simple, rich chocolate flavor. Brushing the muffin tins with melted butter and sprinkling them with a liberal dose of granulated sugar makes these delicate cakes easier to remove and gives them a sp