Preheat oven to 375

Cream the butter and sugar together until light

Add the yogurt, egg and vanilla mix until well blended

Mix the baking powder and baking soda together

Slowly mix the flour mixture with the liquid ingredients

Mix just until all ingredients are well incorporated

Gather dough into 2 balls flatten into disks, wrap in saran wrap and chill for 2 hours or overnight

Take out one disk at a time let sit for a few minutes at room temperature

On a lightly floured board roll dough out to 1/4 inch thickness, cut out into different shape hearts

Bake for 8 to 10 minutes

Cool completely before frosting with royal icing

In an non reactive bowl on high speed beat the egg whites until frothy, add the vanilla then slowly add the powdered sugar will mixing on medium speed

Divide into 3 bowls leave 1 white 1 add 1 drop of red food coloring for a pink shade. In the third bowl add enough red food coloring to get a deep red shade.

Decorate with sprinkles while still wet or let dry completely to add a top coat of royal icing using a tooth pick to draw patterns in different shades.