Preheat oven to 375 degrees. In a large bowl, beat Eagle Brand and peanut butter until smooth. Add Bisquick and vanilla; mix well. Shape into 1-inch balls. Roll in sugar. Place 2 inches apart on ungreased pans. Flatten with a fork. Bake 6 to 8 minutes or until lightly brown. Do not over-bake. Cool and store tightly covered at room temperature.