Delicious Old-Fashioned Thumbprint Cookies: My Grandma’s…

Ingredients

• 1 cup (226 g) unsalted butter, softened
• 2/3 cup (130 g) granulated sugar
• 1 large egg yolk
• 1 teaspoon vanilla extract
• 2 cups (240 g) all-purpose flour
• 1/4 teaspoon salt
• 1/4 teaspoon baking powder
• 3/4 cup (240 g) fruit preserves or jam (e.g., raspberry, apricot, or strawberry)