Roasted Winter Vegetable Chorizo Frittata

From 6 Bittersweets
Adapted from Donna Hay via The Baking Bird
Serves 4

XIAOLU'S NOTES: The original recipe called for 3/4 cup of heavy cream, half of which I replaced with milk instead. I thought the dish tasted perfect, but feel free to use all cream if you want something richer. On the other hand, if you want to lighten it up a bit, try replacing another 3 tablespoons of cream with milk and/or replacing 1 to 2 whole eggs with 2 egg whites per egg.

3 baby beets OR 1 to 2 regular beets, peeled and sliced
2 small red potatoes, sliced
1/4 medium butternut squash, sliced into 1/6 to 1/4-inch strips
1 small to medium red onion, sliced
1 chorizo sausage, crumbled [I used 1 1/2 vegetarian chorizo sausages]
1 to 2 tsp fresh thyme (optional)
2 Tbsp olive oil
5 large eggs
6 Tbsp milk [whole or lowfat, not skim]
6 Tbsp heavy cream
1/2 cup finely grated parmesan cheese
Sea salt and cracked black pepper, to taste.

Preheat oven to 425 degrees F. Place beets, potato, pumpkin, onion, soyrizo, thyme, and oil in a 9 x 13-inch baking dish (about 2-quart capacity) and toss to combine. Roast for 30 minutes or until vegetables are golden and cooked through.

Place eggs, milk, cream, parmesan, salt and pepper in a bowl and whisk to combine. Pour mixture over the vegetables and return to the oven for another 15 to 20 minutes or until puffed and golden.