Creating a Sweet Potato and Kale Frittata is simple if you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Sweet Potatoes: In a medium skillet, heat the olive oil over medium heat. Add the diced sweet potatoes and cook for about 10 minutes, stirring occasionally, until they are fork-tender.
3. Add the Kale: Stir in the chopped kale and cook for an additional 2-3 minutes until the kale is wilted.
4. Prepare the Egg Mixture: In a large bowl, whisk together the eggs, milk, salt, pepper, and garlic powder until well combined.
5. Combine Ingredients: Pour the egg mixture over the cooked sweet potatoes and kale in the skillet. If desired, sprinkle the grated cheese evenly on top.
6. Cook on Stovetop: Allow the frittata to cook on the stovetop for about 3-5 minutes until the edges begin to set.
7. Transfer to Oven: Carefully transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the center is set and the top is lightly golden.
8. Cool Slightly: Remove the frittata from the oven and let it cool for a few minutes before slicing.
9. Garnish: If desired, garnish with fresh herbs for an extra touch of flavor and color.
10. Slice and Serve: Cut the frittata into wedges and serve warm or at room temperature.

By following these steps, you will create a delicious Sweet Potato and Kale Frittata that is sure to impress.