In a saucepan over medium heat, mix sweetened condensed milk, cocoa powder, and salted butter. Stir continuously until the mixture thickens and becomes smooth.
Allow the fudge mixture to cool slightly before shaping it into small mouse bodies using your hands.
Dip each strawberry into the warm fudge mixture until fully coated and place them on parchment paper.
Add two roasted peanuts as ears and colorful sprinkles for eyes on each strawberry.
Refrigerate the assembled mice for about 30 minutes until set, then serve at your Halloween gathering.