In bowl of electric mixer, cream butter and sugar on medium speed for 5 minutes, until light and fluffy. Beat in egg and vanilla. Mix flour, baking powder, and salt in large bowl. Gradually add to butter mixture, beating on low speed, until combined. Gradually add milk, beating constantly until smooth and well combined.
Roll out dough to a thickness of 1½cm (½in) on a lightly floured work surface. Using a cookie cutter, cut into round discs.
Scoop small mounds of chopped pistachios (about ½ teaspoon each) onto a baking sheet, spacing them apart. Place a dough discover nuts, pressing down so nuts adhere to disc bottoms. Brush discs with egg white, then sprinkle generously with sesame seeds to cover.
Bake on middle rack of oven for 15 minutes, or until golden brown.
With marked enthusiasm for his subject and expertise in the cooking field, Chef Osama El-Sayed, C.E.C. can take his audience through a world of culinary delights in several easy steps. With an audience of over a millions viewers on several continents, it is no wonder that Chef Osama has learned to take complex cooking techniques and recipes then simplify them for basic home cooks. Chef Osama’s show "Ma Osama Atyab" - "It's More Delicious with Osama" airs live daily on Dubai TV.