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Preheat the oven to 170c degrees and arrange paper molds in a muffin pan.
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In a large bowl, place eggs, sour cream, milk, oil, sugar and salt and mix to a uniform mixture.
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Add flour, cocoa powder and baking powder and mix until uniform.
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Add chocolate chips and fold gently until they spread evenly in the batter.
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Pour the mixture into the jugs and fill about 3/4 of their height.
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At the top of each muffin, drizzle about a teaspoon of peanut butter and with a knife or toothpick "scribble" slightly between the mixture to create a marble pattern.
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Bake the muffins for 15-20 minutes or until they swell, set and a skewer inserted in the center comes out with moist crumbs.
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Cool at room temperature and serve.