Thumbprint Cookies | Soft Shortbread with a Jam‑Filled Center 🍒 These bring back all those cozy holiday baking memories — buttery, tender cookies with a sweet jam surprise in the middle. Ingredients: 2 cups all‑purpose flour ½ teaspoon baking powder ½ teaspoon salt 1 cup (2 sticks) unsalted butter, softened ¼ cup granulated sugar ½ cup light brown sugar, packed 1 large egg 1 teaspoon vanilla extract 1 cup jam of choice (raspberry, strawberry, apricot — your favorite) Instructions: Preheat the o