
Preheat oven to 375 degrees F. Grease a 9-inch pie pan with nonstick cooking spray. Add sweet potato slices all around the base, cutting some to fit. Bake for 20 minutes and cool for 5 minutes.
In a medium skillet over medium-high heat, add olive oil, onion, and diced tomato; sauté for a few minutes. Add spinach and sauté until wilted. Set aside to cool.
In a medium bowl, whisk together eggs, almond milk, salt, and pepper.
Combine the spinach mixture over the baked sweet potato crust, pour egg mixture over the top, and sprinkle goat cheese on top with extra salt and pepper.
Bake for 30-45 minutes until the egg sets. Cool for a few minutes before slicing into 6 pieces.