Preheat the oven to 350°F.
In a bowl, mix together the graham cracker crumbs, brown sugar, and a pinch of salt using a fork. Pour in the melted butter and mix until combined. Transfer this mixture to a 9-inch pie pan. Using the back of a measuring cup, press the graham cracker crumbs mixture to the bottom and sides of the pan creating a crust.
Bake for 8-10 minutes or until the crust is fragrant and starts to brown. Remove from the oven and let cool.
In a large mixing bowl, whisk together the condensed milk, Greek yogurt, egg yolks, lime juice, lime zest, and a pinch of salt until smooth. Pour the filling over the pie crust and spread evenly.
Bake for 15 minutes. The center should jiggle slightly, but the edges look set. Remove from the oven and let cool completely on a cooling rack. Then, chill in the refrigerator for at least 2-3 hours or overnight.
When 3 hours of chilling is almost passed, prepare the whipped cream topping. Using an electric mixer, beat together the heavy whipping cream, powdered sugar, and salt until medium peaks form. Spread over the chilled pie. Decorate with lime slices and sprinkle with lime zest. Slice and enjoy!