Hi Sue:-) I am posting recipes for you to look at. None of them is exactly the one you are looking for but maybe you can put your own spin on one of them - enough to make it similar to the one you remember from Winn Dixie.

Ambrosia Cake

1/4 cup vegetable oil
2 egg yolks
6 tablespoons water
1 tablespoon grated orange zest
1/2 teaspoon vanilla extract
1/2 cup flaked coconut
1 cup plus 2 tablespoons sifted cake flour
3/4 cup granulated sugar
1 1/2 teaspoons baking powder
4 egg whites
1/2 teaspoon salt
1/4 teaspoon cream of tartar
Whipped topping or sweetened whipped cream
1 small can Mandarin orange slices, drained
flaked coconut

In a large mixing bowl, combine oil, egg yolks, water, grated orange zest, vanilla, and 1/2 cup coconut. Add sifted cake flour, sugar, baking powder. Beat mixture for about 30 seconds at low speed of electric hand mixer. In a separate mixing bowl, beat egg whites with cream of tartar and salt until stiff peaks form. Fold into first mixture gently but thoroughly. Pour batter into an ungreased square 8x8x2-inch baking pan. Bake at 350° for about 30 minutes. Cool upside down for 1 hour. Loosen from pan and split horizontally into 2 layers. Fill ambrosia cake and top with whipped cream. Decorate ambrosia cake with orange slices and sprinkle with more coconut.