This No Bake Key Lime Pie is the perfect recipe for those hot summer days! The base is a buttery graham cracker crust. The filling is made by beating mascarpone and sweetened condensed milk, adding lime juice, and folding in whipped cream. Once transferring the filling into the crust, freeze the pie for a few hours or overnight, and then it’s ready to eat! The recipe really is that simple to make, and the best part is that you don’t have to turn on the oven in the summer heat!