Add 1 Tbsp oil to the pan and heat on medium-high, then add vegetables and cook until softened. Sprinkle vegetables with salt, coat with curry paste, then add coconut milk and garlic powder and stir well. Bring to a simmer and cook until the sauce has thickened, about 10 minutes, then add garam masala and cayenne to taste. Add tofu, and cook for an additional 2-3 minutes, just long enough for the tofu to absorb some of the sauce.