Cornmeal Thumbprint Cookies With Summer Strawberry Jam

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12 Ingredients

• 1/2 cup (1 stick) unsalted butter, room temperature
• 1/2 cup (packed) golden brown sugar
• 1 tsp (packed) finely grated lemon peel
• 1 large egg, separated
• 1 tsp fresh lemon juice
• 1 tsp vanilla extract
• 1 1/4 cups all purpose flour
• 1/2 cup yellow cornmeal
• 1/2 tsp ground cinnamon
• 1/2 tsp salt
• 1/2 cup sugar
• Summer Strawberry Jam