You'll need a 6 cavity silicone shot glass mold for this recipe. They can be found online or at specialty cooking shops. The Rich Tea Biscuits I used as "coasters" are a product of the UK. US readers can find them in the international aisle at the grocery store. I've also purchased them at CostPlus World Market.

3/4 lb. milk chocolate
2/3 cup/ 138g dark brown sugar
1/2 cup/ 113g unsalted butter, cubed
7 oz. (1/2 of a 14 oz. can) sweetened condensed milk (not evaporated milk)
1 teaspoon vanilla
pinch of salt
4 oz. English toffee bits
Whipped cream
Chocolate shavings, if desired
6 Rich Tea Biscuits or any 3-inch round butter cookie