To prepare a Stevies butterscotch bedtime warmer recipe, first you need to prepare the ingredients. First, you'll need the following ingredients: 1 cup (240 mL) granulated sugar 1 tablespoon (2.5 g) butter 2 tablespoons (60 milliliters) evaporated milk 1 teaspoon (0.02 tsp) vanilla extract Instructions: Place the sugar, butter, vanilla, and egg yolks in the bowl of an electric mixer and beat on medium-high speed until the mixture is light and fluffy, about 2 minutes. Then add the vanilla and butter mixture to the creamed mixture and mix until combined. Pour the batter into the graham cracker trays and bake for 20 minutes or until browned and bubbly. Remove from the oven and let cool before serving.