Step 1 — Build the Base (10 Minutes Prep)
Add everything except the bok choy and noodles to your slow cooker mushrooms, onion, garlic, carrots, cubed tofu, broth, soy sauce, rice vinegar, sesame oil, and ground ginger. Give everything a good stir so the seasonings distribute evenly through the broth.
Step 2 — Cook Low and Slow
Cover and cook on high for 4 hours or low for 8 hours. Walk away. The slow cooker does the heavy lifting while you go about your day. By the time it's done, your broth will be deeply flavorful and your tofu will have absorbed all that goodness.
Step 3 — Add Bok Choy and Noodles (Last 5 Minutes)
This step matters don't add the bok choy or noodles at the start. They cook fast and will turn to mush if you add them too early. Once your timer goes off, add the bok choy and noodles directly to the slow cooker and cook on low for just 3–5 minutes. Stir and check that the noodles are cooked through.
Step 4 — Taste, Adjust, and Serve
Taste the broth and adjust the seasoning more soy sauce if it needs salt, a splash more rice vinegar if it needs brightness. Ladle into bowls and top with green onion, sesame seeds, and chili oil. Serve immediately.