Preheat the oven to 425°F (220°C). Prepare the baking tin by lining or greasing it.
In a mixing bowl, combine the melted butter and sugar. Whisk until well combined.
Add the eggs and whisk for 2-3 minutes or until pale in color.
Add the buttermilk, vanilla extract, Greek yogurt, maple syrup, and oil. Mix until well combined.
In a separate bowl, combine the dry ingredients: flour, baking powder, baking soda, salt, instant coffee, and chocolate chips.
Pour the wet mixture into the dry ingredients and mix until just combined. Do not overmix the batter.
Divide the batter evenly among the muffin cups.
Bake for 5 minutes, then after 5 minutes oven door still closed reduce the temperature to 375 F and bake for additional 13-15 minutes or until a toothpick inserted in the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.