Preheat your oven to 400°F and line a baking sheet with parchment paper.
Dice the Yukon gold potato into small 1/2-inch cubes and toss with the olive oil, a pinch of black salt, and black pepper.
Spread the potatoes evenly on the baking sheet and roast for 20-25 minutes until they are golden brown and crispy.
While the potatoes roast, drain the firm tofu and crumble it into a bowl using your hands or a fork until it reaches an egg-like consistency.
Heat a large non-stick skillet over medium heat and sauté the diced red onion and red bell pepper for 5 minutes until softened.
Add the crumbled tofu to the skillet along with the nutritional yeast, ground turmeric, black salt, and black pepper, stirring well to combine.
Cook the tofu mixture for 5-7 minutes, stirring occasionally to ensure even heating and flavor distribution.
Fold in the fresh spinach and cook for 1 minute until just wilted.
Serve the warm tofu scramble on a plate alongside the crispy roasted potatoes.