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1
Spray a 9-inch glass pie pan with cooking spray.
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2
Combine biscuit mix with the 3 tablespoons diet margarine in blender or food processor, using the steel blade.
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3
Process until blended to fine crumbs (mixture will not form a batter; it will have the consistency of heavy flour).
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4
Sprinkle half the flour mixture on the bottom of the pie pan.
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5
Spoon half the apples on top of the flour mixture.
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6
Sprinkle on 4 tablespoons of the sugar substitute.
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7
Spoon on the remaining apples, including any juice in the can.
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8
Sprinkle on the grated peel, if desired.
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9
Add the cinnamon and the remaining 1 teaspoon diet margarine to the remaining flour mixture and process into crumbs.
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10
Sprinkle the crumbs evenly over the apples.
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11
Place on the bottom rack of a preheated 400F (200C).
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12
oven and bake 20 minutes, just until crumbs are lightly browned (don't overbake or sugar substitute will lose its sweetness).
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13
Remove from oven and allow to cool completely.
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14
Stir remaining 2 tablespoons of granulated sugar substitute with confectioners' sugar, if desired, until blended; sprinkle over the top of the crumbs.
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15
Or omit confectioners' sugar and simply sprinkle the top of the cooled pie with sugar-free sweetener.
