Preheat oven to 350 degrees F.
Into a large, deep skillet over medium heat, add vegan butter. When the butter is melted, add the red onion. Saute 2 minutes, to soften.
Add garlic and continue cooking 1 minute.
Crumble tofu into the skillet and add spinach, sea salt, ground black pepper, and turmeric. Stir to combine.
Continue cooking, stirring frequently for about 3 minutes, until tofu is heated through and spinach is wilted slightly. Remove from heat.
Stir in 1 cup of vegan Cheddar cheese and the tater tots.
Into a prepared 9x13-inch casserole dish, spread the mixture in an even layer.