Preheat oven to 350 degrees F. Grease or line a 9x13" baking pan, set aside. In a small mixing bowl combine the flour, baking powder, and salt, stir to combine and set aside.
In a large bowl combine melted butter, sugars, eggs, and vanilla. Whisk well to combine.
Add in the dry ingredients and mix until combined. Fold in the chopped chocolate hearts and white chocolate chips, transfer into the prepared baking pan. If desired, top with extra chocolate hearts and white chocolate chips.
Bake at 350 degrees for 28-30 minutes or until a toothpick inserted comes out clean. Remove form the oven and let cool on a wire rack, top with sprinkles and allow to cool completely before cutting.
Notes
*Set aside whole candy hearts to press on top of unbaked bars if desired. I used Hershey's Strawberry crème filled chocolate hearts, any variety will work.*Set aside a handful of chocolate chips to sprinkle on top*Bars will be fudgy, allow to cool completely before slicing for best results.