"This ain't no picnic" muffin

Name: "This ain't no picnic" muffin
Prep time: 15 min
Total time: 15 min
Yield: 4 porties
Cuisine: Belgian
Ingredients: unsalted butter; milk; natural yoghurt; egg; peanut butter; natural vanilla extract; self-raising flour; caster sugar; dark chocolate chips; roasted unsalted peanuts