Preheat oven to 315 degrees Fahrenheit.
Lightly butter and flour 2 bread loaf pans. Set aside.
In a large bowl, mix together flour, baking soda, and salt. Set aside.
In a stand mixer, cream together butter and sugar, until light and fluffy.
Add vanilla extract, and mix until combined.
Add eggs, one at a time, mixing well after each addition.
Slowly add in flour mixture, in 1/2 cup increments, mixing well after each addition. Mix until combined.
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Mix in crème fraîche (or sour cream) until fully incorporated.
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Pour half of the batter into each of the prepared pans.
Bake the cakes in the oven for one hour. Check the cake for doneness. Cake is ready when a toothpick inserted comes out clean.
Turn cakes out onto a wire rack for cooling. Avoid allowing them to cool in the pan, as this will soften the outer crust.