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Preheat oven to 350 F (175 C).
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Add granulated sugar, cake flour, baking powder, baking soda and salt, and beat in Ninja 2-in-1 for 1-2 minutes until well-mixed. Add butter and mix on medium-low speed for about 2 minutes until well combined and a little crumbly.
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In a separate small mixing bowl, whisk together eggs, sour cream and vanilla extract until smooth. Add the egg mixture to the flour mixture and beat until fully mixed.
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Slowly add milk and mix until smooth.
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Fill cupcake liners just over 2/3 full. Bake for 14 minutes and then test to see if they are done. They are done when a toothpick comes out without wet batter stuck to it. Remove and let cool on a cooling rack.