Thumbprint Cookies Recipe

Ingredients

• 1 cup unsalted butter (2 sticks or 8 ounces), at room temperature
• 1/2 cup sugar
• 2 large eggs, at room temperature
• 1 teaspoon vanilla extract
• 1/4 teaspoon salt
• 2 cups all-purpose flour
• 1 cup chopped nuts (optional)
• 3/4 cup jam, any kind