Sauté Aromatics: Heat olive oil in a pot over medium heat. Add onion and garlic, cooking until softened (about 5 minutes).
Toast Spices: Stir in ginger, coriander, smoked paprika, black pepper, salt, and maple syrup. Cook for 1-2 minutes until fragrant.
Simmer: Add sweet potatoes and vegetable stock. Cover, bring to a boil, then simmer for 15 minutes until potatoes are soft.
Blend Tofu: While the soup simmers, blend silken tofu until smooth. Reserve a few tablespoons for garnish.
Blend Soup: Remove from heat, add blended tofu and lemon juice. Blend with an immersion blender until smooth and creamy. Adjust seasoning.
Serve: Ladle into bowls, swirl in reserved tofu cream, and top with fresh coriander, crispy chili oil, and sourdough croutons.