Line an 8-inch or 9-inch square baking pan with foil, extending foil over edges. Butter foil.
In a saucepan over medium heat, melt butter and marshmallows together, stirring until smooth.
Remove from heat and stir in all remaining ingredients.
Transfer mixed to prepared pan. Use buttered waxed paper to press mix into the pan. If desired, sprinkle the top with any additional dried fruit, nuts or granola.
Let stand 1 hour, or until set.
Using foil, lift bars out of the pan. Cut into bars.
Makes 16 bars.
TO STORE: Layer bars between waxed paper in an airtight container. Store at room temperature up to 3 days.