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Heat oven to 350ºF.
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Coat 9 x 9 x 2-in. pan with nonstick cooking spray.
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In a bowl, mix oats, 3/4 cup yogurt, and brown sugar.
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Press out oat mixture evenly in bottom of pan.
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In a large bowl, whisk egg and cornstarch.
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Add rest of yogurt and white sugar; stir until blended.
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If using frozen blueberries, toss 1 3/4 cup in flour until lightly coated; discard excess flour.
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Gently fold 1 3/4 cup berries into batter; pour evenly over crust.
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Bake for 1 hour or until toothpick inserted into the center comes out clean.
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Cool at room temperature for 30 minutes; refrigerate for at least 2 hours before serving.
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Cut into 9 pieces.
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Garnish each piece with 1/4 cup blueberries.