Preheat the oven heat to 350 degrees F.
Add the bacon to a large skillet over medium heat. Cook until the fat is rendered and the bacon is crispy, then remove the bacon with a slotted spoon. Place it on a paper towel to drain any excess grease. Pour half of the bacon grease into a bowl. To the same skillet, add the spiralized potatoes. Cook for just 1 to 2 minutes, tossing often. Place the potatoes in a bowl.
Add a bit of the bacon grease back to the same skillet. Add the chopped kale and garlic. Cook for a few minutes, just until the kale softens and wilts. Turn off the heat.
Whisk together the eggs, cream, cheese, salt and pepper. Place half of the sweet potatoes, bacon and kale into the crust and pour the egg mixture over top. Add the remaining potatoes, bacon and kale, mixing them in gently. Bake for 55 to 60 minutes, or until golden on top and set in the center. Let sit for about 15 minutes. Serve!