In a large bowl, combine the cracker crumbs, brown sugar and butter until crumbly. Press onto the bottom and up the sides of two greased 9-in. pie plates.

In a large mixing bowl, beat the milk, egg yolks and lime juice on low for 2 minutes or until smooth and slightly thickened.

Pour into prepared crusts. Bake at 350° for 18-22 minutes or until a knife inserted near the center comes out clean. Cool on wire racks for 1 hour. Chill for 6 hours. Garnish with whipped topping, lime and mint if desired. Yield: 2 pies (6-8 servings each).