Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.
Press excess water out of tofu, cut into cubes. Toss gently with cornstarch until coated. Drizzle with a little oil and soy sauce. Transfer to the prepared baking sheet. Bake for 30-40 minutes, until golden and crispy. Toss with hoisin sauce.
While tofu bakes, prepare the vegetables.
Heat 2 tablespoons of oil in a large pot or Dutch oven over medium heat. Add sliced shiitake mushrooms and chopped bok choy. Sauté for 3-5 minutes until softened.
Add minced garlic, minced ginger, and curry powder to the pot. Sauté for another 3-5 minutes until fragrant.
Pour in the coconut milk and broth. Bring to a simmer.
Add ramen noodles and cook according to package directions (usually 3-4 minutes).
Season with salt and a squeeze of fresh lime juice to taste. Serve hot, topped with the crispy hoisin-tossed tofu.