In a separate bowl sift together flour, baking soda, salt,coffee and cinnamon. Add to creamed butter and eggs in thirds the dry mixture, then the milk and eggs, and repeat. Mix well and then fold in the chopped walnuts. Grease the mini bundt pan with spray (grease well;use spray with flour if possible). Using a small spoon fill each bundt well about 2/3 full with batter. Tap the pan to settle the batter and then place into a pre heated 350 degree F oven - on the middle rack. Bake for about 15 minutes or until done ( a toothpick can be inserted into the cake to test, if done it will come out clean). Let cool a few moments, then invert onto a lined baking sheet. Let completely cool and transfer to wire rack to be iced.