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In a medium mixing bowl, whisk together flour, sugar, baking powder, baking soda, salt and lemon zest. In a large measuring cup, mix together milk, vanilla, lemon extract, oil and egg. Whisk until smooth.
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Add the wet ingredients to the dry ingredients and stir with a wooden spoon. Do not over mix. Few lumps in the batter are okay.
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Pour the cake batter into the prepared pan.
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Spoon the pie filling over the cake layer.
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Sprinkle crumb topping over the filling.
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Bake the cake for 30 to 35 minutes or until the topping is golden brown.
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Let cool completely in the pan.
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Transfer onto a serving plate or stand. Slice and serve.
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Keep in a covered container for up to 4 days.
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