Blueberry Oatmeal Bars (with spinach puree) Recipe from Jessica Seinfeld - Jessica Seinfeld

Ingredients

• nonstick vegetable cooking spray
• 2 cups old-fashioned rolled oats
• 1 1/4 cups all-purpose flour
• 1/2 cup sugar
• 1/2 teaspoon cinnamon
• 1/4 teaspoon baking powder
• 1/4 teaspoon kosher salt
• 1 teaspoon pure vanilla extract
• 3/4 cup butter or trans-fat-free soft tub margarine, chilled
• 1 cup low-sugar blueberry preserves
• 1/2 cup spinach puree