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1
Preheat oven to 350.
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2
Spray a 9 inch square pan with vegetable spray.
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3
In prepared pan, stir together brown sugar, corn syrup and margarine.
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4
Place the pan in the oven for 5 minutes.
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5
Stir the mixture until it is well mixed (it will be stick and thick).
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6
Zest one orange.
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7
Using a sharp paring knife, cut the rind and pith away from both oranges (including the one you zested).
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8
Slice oranges crosswise into 1/4 inch slices.
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9
Place the slices in a single layer at the bottom of the pan.
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10
In a bowl, beat sugar, orange rind, yogurt, orange juice, oil, egg and egg whites.
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11
In another bowl, stir together flour, baking powder and salt.
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12
With a wooden spoon, stir the dry ingredients into the orange mixture until everything is just combined.
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13
Pour the mixture into the pan.
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14
Place the pan in the centre of the oven and bake 30 minutes or until tester comes out dry.
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15
Let the pan cool on a wire rack for 20 minutes.
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16
Carefully invert the cake onto a serving plate.
