Prepare all of your ingredients and preheat the griddle to medium heat for a few minutes.
Add some olive oil to the griddle and the sweet potatoes, kosher salt, and pepper. Add some water and cover with a melting dome. Cook the sweet potatoes 9 to 11 minutes total. Remove the melting dome to flip them and add more water each time before covering with the melting dome again.
Set the melting dome aside, add more oil to the griddle along with the chopped kale, more kosher salt, and pepper and another drizzle of olive oil. Cook together with the sweet potatoes for 3 to 4 minutes.
Add the quinoa, cranberries, lemon juice, cumin, more kosher salt, pepper, and olive oil and cook together for another minute. Top with feta cheese before serving.