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1
To make the crust: in a large bowl, using an electric mixer on medium speed, beat together the butter and flour until crumbly and well combined.
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2
Transfer the mixture to an ungreased 13x9 inch baking pan.
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3
Using your hands, pat the crust firmly and evenly into the pan.
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4
Bake in a 350u00b0 oven for 20 minutes; remove from oven a let cool completely, about 45 minutes.
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5
To make the topping: in a large bowl, mix the flour, sugar, oats, and cinnamon together.
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6
With a pastry blender, cut in the butter until the mixture resembles coarse crumbs; then using your hands, toss until all the ingredients are well combined; set aside.
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7
When the crust is cooled, evenly spread the apple filling over the crust, leaving a 1/4-inch edge all around.
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8
Sprinkle the crumb topping over the apple filling; sprinkle the additional 3 tablespoons rolled oats over the crumb topping.
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9
Bake for 45 minutes; allow to cool to room temperature.
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10
To make the glaze: In a bowl, combine the sugar and water; beat until smooth.
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11
Cover until ready to use.
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12
When the bars are completely cooled, drizzle the glaze decoratively over the crumb topping.
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13
Allow the glaze to set for 15-20 minutes before cutting into bars and serving.
