Preheat oven to 350 degrees F and line baking sheets with parchment paper. Place butter, brown sugar, and granulated sugar in a stand mixer. Beat on medium-high speed until light and fluffy, about 2 to 3 minutes.
Add the eggs and beat until blended. Add the vanilla and mix.
Whisk flour, baking soda, and salt together in a medium bowl. Slowly, add flour to wet ingredients. Mix on medium speed for about 30 seconds, or until the flour has mixed in.
Add in heavy cream and broken Poptart's and stir.
Chill cookie dough for 30 minutes.
Place spoonful of cookie dough on a lined baking sheet.
Bake in preheated oven for about 10-12 minutes.
Transfer cookies to cooling rack until cooled completely.