Silvanas / Sylvanas

Ingredients

• 5 large egg whites, room temperature
• 1/2 tsp cream of tartar
• 1/2 cup granulated sugar
• 1 1/2 cups ground cashew
• 1/2 tsp vanilla extract
• 1 cup butter, softened at room temperature
• 3/4 cup powdered sugar
• 1 1/2 tbsp milk
• Marie biscuits or similar, crumbs