1. Whisk flour and baking soda together in a medium bowl and set aside.

2. Melt 14 tablespoons butter in a saucepan over medium heat until melted (could also be down in a bowl in the microwave- just be careful and cover the bowl so the butter doesn't splatter).

3. Transfer melted butter to a mixing bowl. Add brown sugar, granulated sugar, salt, and vanilla to the mixing bowl. Whisk until incorporated. Add the egg and egg yolk; whisk until the mixture is smooth with no sugar lumps remaining, about 30 seconds. Let mixture stand for 3 minutes, then whisk for 30 seconds. Repeat until the mixture is thick, smooth, and shiny.

4. Using rubber spatula, stir in flour mixture just until incorporated (about 1 minute). Stir in sprinkles and chocolate chips. Give dough one final stir to ensure all flour is incorporated.

5. Transfer dough to a 9-inch pie plate. Gently press dough down to fit into the pie pan.

6. Bake for 30-40 minutes in a pre-heated 350 degree oven.

7. Allow pie to cool completely before adding the frosting. To make the frosting in a mixing bowl: cream the butter until light and fluffy about 3 minutes. Add the powdered 1/2 cup at a time. Mix on low to ensure the powdered sugar doesn't fly out of your bowl! Scrape down the sides of the bowl with a spatula as necessary. When all the powdered sugar is added, add in the heavy cream and vanilla. Begin mixing on low until incorporated, the mix on medium high for 8 minutes. Use a piping bag and pipe swirls around the edge of the pie.