Preheat oven to 350F. Line an 8-inch square baking dish with parchment paper. Set aside.
In a mixing bowl, blend brown sugar with melted butter. Add in eggs and vanilla, stirring until combined. Add salt and flour, mixing until well blended. Fold in white chocolate chips and sprinkles. Pour into prepared baking dish.
Bake for 32-35 minutes. Remove from oven and cool on wire rack.
For the frosting, beat butter, powdered sugar, vanilla and milk for 4-5 minutes using an electric mixer, until fluffy. Fold in sprinkles. Spread over cooled bars. Cut and enjoy.
Store bars in airtight container at room temperature. ENJOY.
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