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1
Set oven to 350 degrees F.
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2
Set oven rack to second-lowest position.
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3
Grease a 13 x 9-inch baking dish.
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4
Prepare two separate medium bowls.
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5
In each bowl place 1 cup oats, 3/4 cup brown sugar, 1 cup flour, 1-1/2 teaspoons cinnamon, 1/4 teaspoon baking powder and 1/4 teaspoon baking soda; toss to combine.
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6
To each bowl mix in 1/2 cup plus 2 tablespoons melted butter; mix well to combine then finish mixing using your hands until the mixture is crumbly.
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7
To one bowl only add in 1/2 cup nuts (this bowl will be your topping mixture).
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8
Sprinkle the bowl without the nuts into the bottom of the baking dish; pat down only slightly with hand.
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9
For the apple filling; in a bowl toss the apple slices with lemon juice.
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10
In a small bowl mix together 1 cup sugar, 2 tablespoons flour, 2 teaspoons cinnamon and nutmeg; toss to combine; add to the sliced apples then toss to combine.
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11
Place the apples over the crumb crust.
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12
Sprinkle the remaining topping (with nuts) over the apple mixture.
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13
Bake for about 40-45 minutes or until apples are fork-tender (stick a fork into the apples after about 35 minutes of cooking time to see if they are cooked to desired doneness).
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14
Serve with vanilla ice cream.
