Preheat oven to 375 degrees.
Sift together flour, salt, and baking soda. Set aside. Cream together the butter, sugar, peanut butter, and brown sugar until fluffy. Beat in egg, vanilla, and milk. Add flour mixture; mix well. Shape into 40 balls and place into greased mini muffin pan. Bake for 8 min. Remove from pan and immediately press a mini peanut cup into each ball.
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