Preheat oven to 325°. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in vanilla. Gradually add flour to creamed mixture and mix well., Shape into 3/4-in. balls. Coat bottom of a glass with cooking spray, then dip it in sugar. Flatten cookies with prepared glass, redipping glass in sugar as needed. Place on baking sheets. Bake until set, 12-15 minutes. Remove to wire racks to cool completely., In a small bowl, beat the brown sugar, peanut butter and butter until smooth. Spread 1 teaspoon over each cookie. Combine glaze ingredients; gently spread 3/4 teaspoon over each peanut butter layer. Store in a single layer in airtight containers.