Preheat oven to 350°F and prepare two cupcake pans.
Sift flour, salt, and baking soda in medium bowl.
In bowl of mixer, cream butter and sugar until fluffy. Add eggs one at a time until combined. Add buttermilk (or sour cream), oil and vanilla until combined. Add flour mixture and stir until just combined. Fold in berries.
Fill cupcake pans 3/4 way. Bake for 15-20 minutes. Allow to cool completely before frosting.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.