Preheat your oven to 350 degrees and grease a 9”x5” loaf pan (line with parchment if your loaf pan is not non-stick)
In a large bowl, combine 6 tablespoons of softened butter with 1 cup of granulated sugar, 2 large eggs, 1/2 cup of sour cream, 1/2 cup of whole milk and 1 teaspoon of vanilla extract and whisk vigorously
Add 1 tablespoon of espresso powder, 2 cups of all purpose flour, 1 1/2 teaspoons of baking powder and 1/2 teaspoon of salt and mix until just combined
Add a cup of miniature chocolate chips, mix until evenly distributed and set aside for now
In a separate bowl, combine 1 cup of all purpose flour with 1/4 cup of granulated sugar, 1/4 cup of brown sugar and 1/2 teaspoon of ground cinnamon
Use a fork to work in 4 tablespoons of melted and cooled butter and 1/2 teaspoon of vanilla extract until large crumbs develop and then mix in 1/2 cup of mini chocolate chips
Pour the batter into your prepared loaf pan and then sprinkle the crumb topping evenly over the top
Bake in a 350 degree oven for 65-75 minutes or until a toothpick will come out of the center clean and the loaf feels set to a light touch
Transfer the loaf pan onto a cooling rack and let the loaf cool for about 20 minutes before transferring it out of the loaf pan and directly onto the cooling rack to continue cooling
Enjoy warm or at room temperature
Store leftovers in an airtight container