Rainbow Cake
| Yield: | 14 Servings | 
| Categories: | Cakes, Low-Fat | 
| Cake | ||
| 1 1/2 | c | Cake flour | 
| 1 | ts | Baking powder | 
| 1 | ts | Baking soda | 
| 1/4 | ts | Salt | 
| 1/4 | c | 70% buttermilk-vegetable oil spread, at room temperature | 
| 1 | c | Granulated sugar | 
| 1 | Egg; separated & divided | |
| 1 | ts | Vanilla | 
| 1 | Egg white | |
| 2/3 | c | Lowfat buttermilk | 
| 1/2 | c | Flaked sweetened coconut | 
| Frosting | ||
| 3 | c | Confectioner's sugar | 
| 1/4 | c | 70% buttermilk-vegetable oil spread | 
| 2 | ts | Vanilla | 
| 1/2 | ts | Rum extract | 
| 1/4 | ts | Salt | 
| 2 | tb | 1% low-fat milk; divided | 
| Red; yellow, green and blue food coloring | 
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