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1
Preheat oven to 350u00b0.
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2
Beat butter with a mixer at medium speed until light and fluffy. Add sugar, vanilla, and egg; beat until smooth.
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3
Lightly spoon flour into a dry measuring cup; level with a knife. Combine flour, cocoa, baking powder, and salt. Add flour mixture, alternately with egg mixture and milk. (Batter will be very stiff.)
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4
Transfer mixture to a 9-inch pie plate coated with cooking spray, spreading evenly on bottom.
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5
Bake at 350u00b0 for 15 to 17 minutes or until a wooden pick inserted in center comes out clean. Cool completely on a wire rack.
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6
Spoon yogurt into brownie crust, smoothing the top. Cover and freeze until firm.
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7
Spread whipped topping over top of pie. Cover and freeze until firm.
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8
Cut pie into 10 slices. Drizzle each slice of pie with 1 tablespoon chocolate syrup, and top with a cherry.
