Put the canola oil in a large pot over medium heat. Add the ginger and saute for 1 minute, then add the garlic and saute for 2 minutes more. Add the chili paste, soy sauce, oyster sauce, and chicken broth. Stir the ingredients to combine and bring to a simmer. Put the mussels in the pot and steam them with the lid on until the mussels have opened, about 5 to 8 minutes. Pour the mussels with their sauce into a serving dish and garnish with the sliced scallions.