Preheat the oven to 350F and line a muffin pan with paper liners

In a large bowl, mix together the melted butter, sugar, vanilla, milk, coconut yogurt, and eggs, and whisk until smooth.

In a separate bowl, sift the dry ingredients: flour, baking powder, cinnamon, and salt, and whisk together. Add the dry ingredients to the wet ingredients and mix until combined.

Fold in the chocolate chips. I used a mix of chocolate chips and chocolate chunks!

For the streusel: in a small bowl, combine all the ingredients and using your hands, break up the cold butter until you get a crumbly mixture.

Scoop the batter and divide among the muffin pan. Fill about 1/3 of the paper liner with batter, sprinkle a tbsp of streusel over the batter. Add the remaining batter and top with streusel.

Bake for 35 minutes, or until a toothpick inserted into the center comes out clean.

When ready to serve, top with a tsp of melted butter! Serve warm.