Preheat the oven to 350 degrees f.
Lightly grease a mini muffin tin (24 count). Line a baking sheet with parchment paper.
In a large bowl or stand mixer, combine dry ingredients. Add butter, egg and vanilla and mix until a soft dough forms. Add Valentines sprinkles.
Roll the dough into walnut sized dough balls.
Place one dough ball into each greased muffin cup. Spread the dough up the sides of the tin to form a cup shape.
Bake until cookies are lightly brown around the edges, 10-12 minutes.
Remove the tray from the oven and while still hot, use the end of the muddler to press down the middle of the cookie cups. Let cool.
Remove the cookie cups from the muffin tin and pace them on the prepared cookie sheet or a wire rack.
In a medium bowl combine the frosting and a few drops of red food coloring. Mix until a medium pink color is achieved.
Spoon the frosting into a piping bag. Tip: a freezer bag can also be used.
Cut the tip from the bag and pipe the frosting into the cups.
Top with Valentine sprinkles and red candy hearts.