While the mini tart shells are cooling, you can start working on your filling. It’s very simple. Whisk 4 whole eggs in a big bowl, add 2/3 cup of freshly squeezed lemon juice, 2 tablespoons of sour cream and 1/2 cup of confectioners sugar. Whisk everything together and pour it into the mini tart shells with a measuring cup. Bake the mini tart shells in the oven at 325 degrees for about 15 – 18 minutes. Now you’re ready to make the whipped cream. Again, very simple. Put 1 cup of cold heavy cream in a big bowl. Add 2 teaspoons of vanilla extract and 2 tablespoons of light brown sugar. Beat the mixture with a hand mixer until it becomes thick and makes a soft peak. Your whipped cream is done. Full recipe including instructions for tart shells here.