Preheat the oven to 350 degrees. Line two baking sheets with parchment and set aside.
In the bowl of a stand mixer, combine the softened butter, sugar and powdered sugar. Cream until smooth.
Add in the egg and vanilla. Mix on low until combined, scraping the sides often.
Add in the flour, salt and baking powder and mix until combined.
Add in the sprinkles and mix thoroughly, scraping the sides as needed.
Measure out the cookie dough with a large ice cream scoop. Divide the dough between 8-10 large cookies and place on the baking sheets with plenty of room to allow for spreading.
Bake in the preheated oven for 12 minutes. Allow to cool on the baking sheets.
For the frosting - in the bowl of a stand mixer, combine the softened butter, powdered sugar and emulsion. Mix on low until combined.
Add in the heavy cream and mix on low until combined. Scrape the sides often and then bump up the speed to medium and mix until smooth and fluffy.
Transfer the frosting to a piping bag and set aside.
To make the whipped cream - in the bowl of a stand mixer, combine the heavy cream, vanilla and powdered sugar. Mix on low for about 2 minutes and then bump up the speed to medium and whip until stiff peaks.
Transfer the whipped cream to a piping bag fitted with a large star tip.
To assemble - once the cookies are cool, pipe a swirl of frosting onto each cookie.
Top with a small dollop of the whipped cream.
Decorate with additional sprinkles on top.