Butter a 9-inch-square baking pan; set aside. In a large saucepan over medium heat, melt butter. Add marshmallows; stir until melted, about 4 minutes. Remove from heat.
Stir in peanut butter and granola until well combined. Transfer mixture to prepared pan. Dampen your hands, and press mixture into prepared pan, distributing mixture evenly. Set aside to cool. Invert pan, releasing bars. Cut into sixteen squares. Store in an airtight container up to 3 days.
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