Butter and Jam Thumbprint Cookies

This is one of my top 2 favorite cookies- tied with oatmeal chocolate chip.  I make these cookies every Christmas to give away as gifts.  I usually double the recipe- these cookies are just that good.  I think I originally got the recipe from Emeril.  Thanks, Emeril!

Butter and Jam Thumbprint Cookies
1 3/4 cup all purpose flour
1/2 teaspoon baking powder
1/2 teaspoon salt
1 1/2 sticks unsalted butter (softened)
2/3 cup sugar (plus more for rolling)
1 large egg
1 teaspoon vanilla
1/3 cup seedless raspberry jam (honestly, it could be more than this.  I don't measure it, just fill the thumbprints)

Whisk flour, baking soda, and salt together in a bowl.  In another bowl, whip the butter and 2/3 cup sugar with a hand held mixer until fluffy- about 5 mins.  Beat in the eggs and vanilla until just combined.  Slowly beat in the dry ingredients in 2 additions, mixing until just incorporated.  Scoop the dough with a cookie scoop and roll it in sugar.  Place about 2 inches apart on baking sheet lined with parchment paper. Use the back of a teaspoon measure to make a "thumbprint" in the cookie.  Fill thumbprint with raspberry jam.  Bake at 350 for 15 mins.