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1
Heat the oven to 350 degrees F and arrange a rack in the middle.
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2
Generously coat an 8-by-8-inch baking dish with butter and set it aside.
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3
Place the apples, vanilla extract, sugar, and water in a small pot over low heat and cover.
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4
Cook for approximately 20 minutes.
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5
Once the apples are tender, smash them with the back of a spatula until you have a chunky compote texture.
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6
Meanwhile, make the crust: Place the oats, both flours, and the salt in a large heatproof bowl and stir to combine.
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7
Place the measured butter, honey, and brown sugar in a saucepan.
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8
Bring to a boil over medium-high heat and cook, stirring occasionally, for 5 minutes.
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9
Immediately pour the butter mixture over the oat mixture and stir until the oats are evenly coated.
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10
When the mixtures cool enough to handle but still warm, use a measuring cup to evenly press half of it (about 1 1/2 cups) into the bottom of the prepared baking dish; set it aside.
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11
Spread the apple compote evenly over the oat base.
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12
Evenly sprinkle the remaining oat mixture over the apple compote and gently press it in with your fingers.
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13
Bake until the top is browned, about 30 to 40 minutes.
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14
(If youre using a glass or ceramic baking dish, it may take 5 minutes longer.)
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15
Remove from the oven to a wire rack and let cool completely before cutting into squares, about 1 to 2 hours.
