Preheat oven. Preheat oven to 350°F (175°C). Grease or line a 6-cup muffin tin and set aside.
Cook vegetables. Heat a pan over medium-high heat with a drizzle of oil or water. Add garlic and cook until golden, about 1 minute. Add broccoli, bell pepper, and corn. Season with salt and pepper and stir-fry for 1 minute. Add scallions and cook 30 more seconds. Remove from heat and allow to cool slightly.
Blend tofu base. Gently squeeze excess water from tofu. Add tofu to a food processor and blend until smooth. Add chickpea flour, nutritional yeast, tahini, miso paste, turmeric, onion powder, salt, pepper, and black salt. Blend until fully combined and creamy.
Combine. In a large bowl, mix the tofu base with the cooked vegetables. Stir until evenly combined.
Fill muffin tin. Spoon the batter into the 6 muffin cups, filling each nearly to the top. Press down gently with the back of a spoon to pack evenly.
Bake. Bake for 25–35 minutes, rotating the pan at the 15-minute mark. Muffins are done when the tops are lightly golden and a toothpick inserted in the center comes out clean.
Cool and serve. Let muffins cool in the tin on a wire rack for at least 10 minutes before removing. Serve warm or at room temperature.