Preheat oven to 350 degrees. Prepare a baking sheet with parchment paper. Mix the flour, sugar and baking powder in a large bowl. Add butter and mix with a fork without overdoing it. It must stay crumbly and dry. Incorporate buttermilk until the mixture stays together. With your hands, make 2-inch balls of batter. Flatten balls in the center. Add 1/2 T. nutella (or more if you like them sweeter). Close balls, and don’t worry if they stay uneven. Decorate with sliced almonds and sugar crystals. Bake 15-20 minutes or until golden brown.