Line your muffin cups with paper cases, alternating each cup on the tray. Preheat the oven to 425F.
In a large mixing bowl add the melted butter, oil, warm water, instant coffee and whisk until the coffee is dissolved.
Add the brown and white sugar and whisk. Add the vanilla, eggs and whisk well until combined. Add the yogurt and butter milk, whisk again.
Sift in the flour, cocoa powder, baking powder, baking soda and salt. Whisk until there are no dry pockets visible. Add 1/2 cup chocolate chips and fold together.
Using an ice cream scoop, fill each muffin case with 3 scoops of batter, top with a few chocolate chips and repeat.
Bake for 6 mins at 425F. Reduce the heat to 375F and finish baking for 14-16 minutes or until a tooth pick inserted in the centre comes out clean or with moist crumbs.
Let them cool while we make the ganache. Warm the cream in a sauce pot until simmering, take it off the heat, add the chocolate chips, corn syrup and let it sit for a couple of minutes. Gently stir it together until combined, pour into piping bag fitted with a round nozzle.
Once the muffins are cool, make a small cavity with a knife on the top, fill each cavity with the chocolate ganache. Repeat until done.
Serve with milk and enjoy.