Step 1

Preheat the oven to 350F degrees. Then grease and flour a 9x13 inch baking pan.

Step 2

In a large bowl sift together the flour, baking powder, baking soda, and salt.

Step 3

In a separate large bowl beat the butter and sugar together until fluffy (about 2 minutes).

Step 4

Add in the vanilla extract, then beat in the eggs 1 at a time.

Step 5

With the mixer on low speed, beat in the sour cream followed by about 1/2 of the flour mixture. Turn off the mixer and scrape down the sides of the bowl as necessary.

Step 6

Then mix in the milk, followed by the rest of the flour mixture.

Step 7

Turn off the mixer and gently stir in the sprinkles using a large rubber spatula.

Step 8

Pour the batter into the prepared pan and bake for 25-30 minutes, or until an inserted toothpick comes out clean.

Step 9

In a large bowl beat the butter until fluffy.

Step 10

Beat in 3 cups of powdered sugar, starting with the mixer on low speed then gradually increasing the speed as it begins to incorporate.

Step 11

Then add in the salt. Mix in the rest of the powdered sugar about 1/2 cup at a time, alternating with a tablespoon or 2 of cream until the desired sweetness level is reached.

Step 12

Frost the cooled cake and decorate with sprinkles