Jam Thumbprints Recipe
1 1/2 cups unsalted butter, softened
1 cup sugar
1 large egg
3 1/4 cups all-purpose flour
3/4 cup jam, such as raspberry, blueberry, plum, or lingonberry
Preheat oven to 350 degrees F. In bowl, beat butter and sugar with electric mixer on medium-high heat speed until pale and fluffy, 3 to 4 minutes. Add egg, and beat until completely combined. Reduce speed to low, add flour, and mix just until incorporated. Shape dough into 1-inch balls. Place on parchment-lined baking sheets, spacing at least 3 inches apart. Moisten thumb with water, and gently press center of each ball to make indentation. Heat jam in small saucepan over medium until melted; spoon about 1/2 teaspoon into each indentation. Bake, rotating sheet halfway through, until cookies are golden brown around edges, 18 to 20 minutes. Transfer to a wire rack, and let cool completely. Cookies can be stored in single layers in an airtight container at room temperature up to 2 days.