Heat the potatoes in a skillet over medium heat for about 5 minutes.
Add onion, mushrooms, pepper, and spinach. Cook another 5 minutes.
Add the tofu and spices to a high speed blender and blend until smooth.
Add the cooked veggies to the blender and pulse a few times to combine - do not over mix, you want the veggies to stay mostly intact.
Pour the mixture into a 9" deep dish pie pan.
Bake for 40-45 minutes. The frittata will bubble rapidly then turn golden and become somewhat firm. If the frittata does not feel totally firm, that's okay, it will firm up as it cools.
Remove from the oven and let the frittata cool for 15 minutes - this what helps it solidify. Then slice and garnish with fresh chives. Enjoy!