Press 1-1/2 cups of oat mixture into an 8-in. Carefully spread preserves over crust; sprinkle with blueberries. Top with remaining oat mixture. Bars that taste like fruit pie sandwiched between oatmeal cookies. Bake at 350° for 25-30 minutes or until lightly browned. square baking dish coated with cooking spray. Made with healthier-for-you ingredients. Cut into bars… I have a soft spot for fruity oat crumble bars. Cool on a wire rack. I love how the baked fruit turns into a fresh jam. It reminds me of a fruit pie… that is sandwiched between oatmeal … Mixed Berry Oat Crumble Bars recipe.