Peanut Butter-Granola Munchies

Combine margarine and peanut butter in a large saucepan; place over low heat until margarine and peanut butter melt, stirring frequently. Add marshmallows; cover and cook 5 minutes or until marshmallows melt, stirring occasionally. Remove from heat, and add granola. Working rapidly, toss the mixture gently, and spread into the bottom of an 8-1/2 x 4-1/2 x 3-inch loaf pan coated with cooking spray. Let cool completely in pan. Remove from pan; cut in half lengthwise, and then slice each half crosswise into 8 (1-inch) pieces.