Port Plums Thumbprint Butter Cookies – Affamata

Ingredients

• 2 cups all-purpose flour
• 1/2 tsp baking powder
• 1/2 tsp salt
• 1 1/2 sticks (6oz) unsalted butter, softened
• 1 cup sugar
• 1 large egg, at room temperature
• 1/2 tsp vanilla
• Port Plum Jam, for filling