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Steps
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Sequence
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Step
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| 1 | Have all ingredients at room temperature (70F). Adjust oven racks to divide oven in thirds; preheat oven to 325F. |
| 2 | Preheat oven to 325F. Spray 5 cup loaf pan with cooking spray. |
| 3 | In small bowl, whisk together flour, baking powder, baking soda, and salt; sift together and set aside. |
| 4 | In small bowl, whisk together egg and egg whites; set aside. |
| 5 | In small bowl, combine buttermilk and vanilla; set aside. |
| 6 | Cut butter into 1/4" chunks and place in large bowl of electric mixer; beat at medium speed until softened, about 1 minute. |
| 7 | Add sugar gradually, beating constantly, until smooth, about 3 minutes. |
| 8 | Gradually dribble in beaten eggs, beating at medium-high speed for 2-3 minutes. |
| 9 | On low speed of electric mixer, beat in 1/3 of the reserved flour mixture, scraping sides of bowl. |
| 10 | On medium-high speed, gradually dribble in 1/2 of the buttermilk mixture, scraping sides of bowl. |
| 11 | On low speed, beat in half of the remaining flour mixture. |
| 12 | On medium-high speed, beat in the rest of the buttermilk mixture, scarping sides of bowl. |
| 13 | On low speed, beat in the remaining flour mixture until well combined (batter may look curdled). |
| 14 | Pour into prepared pan and bake until cake starts to pull away from the sides of the pan, the top is golden brown and a toothpick inserted in the center of the cake comes out clean. Cool on rack 10-15 minutes; invert pan and unmold onto rack to cool completely. Cut into 12 slices. |
