Heat oven to 350 and line a cookie sheet (with sides) with parchment paper.

In a big stainless steel bowl, melt butter and dark chocolate in the microwave (yes, you read it right...microwave...as long as it is stainless steel, it can go in the microwave). Heat for 2 minutes on high and stir until all is melted and smooth.

In another bowl, combine eggs, coffee, vanilla and sugar. Whisk vigorously until combined. Add to chocolate and butter mixture and whisk again....it should be oh soooo chocolatey!

In yet another small bowl (I know, I hate washing dishes too, but this will be worth it), combine flour, baking powder and salt. Whisk (or sift through a sieve) and add to chocolate...add chocolate chips and blend again.

Pour into pan and smooth out. Sprinkle walnuts (if using) over top and bake in oven for 30 minutes (don't overcook or you will lose the fudgy goodness!). Remove from oven...slice a big chunk...pour a BIG glass of milk and enjoy every bite!