Preheat oven to 350ºF. Butter and line with parchment paper an 8"x5" loaf pan.
For the wet ingredients, in a large mixing bowl, whisk together ½ cup chocolate chips, instant coffee, and boiling hot water until melted and smooth.
Add cocoa powder vanilla, and brown sugar, and whisk again.
Whisk in eggs and oil.
For the dry ingredients, add all-purpose flour, baking soda, and salt. Mix just until combined. Don't overmix.
Fold the remaining chocolate chips into the batter. (Optional step: Toss the chips in 1 tablespoon flour prior to folding in for even dispersion in the loaf). Pour the batter into the prepared pan.
Bake at 36-40 minutes or until a toothpick inserted in the middle comes out clean.
Cool in the pan on a wire rack for 5-10 minutes. Remove from the pan and place on a cutting board. Slice and serve.