Blueberry Oatmeal Bars (with spinach puree)

INGREDIENTS

nonstick vegetable cooking spray

2 cups

old-fashioned rolled oats

1 1/4 cups

all-purpose flour

1/2 cup

sugar

1/2 tsp

cinnamon

1/4 tsp

baking powder

1/4 tsp

kosher salt

1 tsp

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