Roast squash, Brussels sprouts, and onion with olive oil, salt, and pepper at 400°F for 25 to 30 minutes.
Sear crumbled tempeh with smoked paprika and garlic powder in olive oil for 5 to 7 minutes until golden and crisp. Set aside.
Whisk eggs, milk, cheese, herbs, salt, and pepper.
Reduce oven to 375°F.
Combine roasted vegetables and tempeh in the skillet, then pour in the egg mixture.
Cook on the stovetop over medium-low heat for 3 to 4 minutes until edges set.
Bake 15 to 18 minutes until the center is just set and the top is golden.
Rest 5 minutes before slicing.