Preheat oven to 325 ° F. Line baking sheet with parchment paper. Set aside.

In the bowl of a mixer, cream together butter, both sugars and vanilla until light and fluffy.

Add egg, mixing well.

Slowly add in flour, salt, baking powder, and baking soda. Mix well.

Fold in oats.

Separate the dough in half, placing them each in a bowl.

add red food coloring to one bowl and blue food coloring to the other bowl. Mix them both adding coloring until desired color is achieved.

Starting with one color at a time, roll dough into 1" inch balls and place onto prepared baking sheet.

Bake for 8-10 minutes or until edges are lightly golden and the center is just set.

Remove from oven when done and allow to completely cool.

In the meantime whip together butter and shortening until combined.

Add 1 cup of powdered sugar at a time, mixing until combined and scraping down the sides/bottom of the bowl.

Add vanilla and mix frosting on medium high speed for approximately 5 minutes.

Put frosting in piping bag.

Match your cookies into similar sized pairs.

On the bottom side of your first cookie pipe a generous amount of the frosting, being sure to get all of the way to the edge.

Take your second cookie and place on top of the frosting.

Repeat till done.

Serve and ENJOY!