Combine 4 cups boiling water and porcini; let stand 15 minutes. Drain through a sieve over a bowl; reserve porcini and soaking liquid. Slice porcini; set aside.
Heat a Dutch oven over medium heat. Add bacon; cook until almost crisp. Increase heat to medium-high. Add onion and carrot; sauté 2 minutes. Combine miso and soy sauce. Add miso mixture, porcini liquid, stock, garlic, and ginger to pan; bring to a boil. Reduce heat, and simmer for 20 minutes. Strain mixture through a sieve over a bowl; discard solids. Wipe pan clean. Return broth to pan; bring to a boil. Add noodles; cook 8 minutes or until tender. Remove from heat.
Heat a large skillet over medium-high heat. Add 1 tablespoon sesame oil to pan; swirl. Add fresh mushrooms; sauté 8 minutes. Remove from pan; combine porcini and fresh mushrooms. Add remaining 1 tablespoon sesame oil to pan; swirl. Add chicken, skin-side down; sauté 7 minutes or until skin is very crisp and golden brown. Turn chicken over; sauté 2 minutes or until done.
Place eggs in a small saucepan; add water to cover. Bring to a boil; cook for 1 minute. Remove from heat; let stand 3 minutes. Drain; rinse under cold water. Drain and peel.
Divide noodle mixture among 6 bowls; top each serving with 3 tablespoons mushroom mixture, 2 tablespoons green onions, 1 chicken thigh, 1/2 egg, and 1 teaspoon sambal.
Like other reviewers have said, this is time consuming. But it is so worth it! I had a mix of udon noodles and soba noodles, so I used those instead of ramen noodles. I cooked my eggs a little bit longer than I should have, so they weren't soft boiled like they should have been. This was also more like a pasta with an awesome sauce rather than a soup.
Really fantastic soup! I suggest using Udon noodles. The chewy noodles make it great! But be prepared for this to take some time. The egg was really fantastic but I chose to poach one egg per bowl rather than boil the eggs. Makes great leftovers as well, though I left out the egg for the leftovers.