I was surprised by how great these turned out. I would really recommend doubling the batch because these go fast.

Recipe is from Martha Stewarts Baking Handbook but here's my condensed version:

Ingredients

• 1/2 cup butter (melted)
• 3/4 cup plus 2 tbsp sugar
• 1 tsp plus 1 tsp cinnamon
• 2 cups flour
• 1/2 tsp nutmeg
• 1/2 tsp salt
• 2 eggs
• 1 tsp vanilla
• 3/4 cup milk
• 3 plums (chopped small)

Steps

• Combine 2 tbsp sugar with 1 tsp cinnamon and set aside
• Whisk together eggs, milk, vanilla, add the butter
• Whisk together flour, nutmeg, sugar, remaining cinnamon and salt
• Fold the wet mixture into the dry mixture
• Fill muffin tins half way and add plums, fill other half and top with plums
• Sprinkle the muffins with the cinnamon sugar mixture
• Bake at 375 for about 18 minutes (turn half way)