Pre-heat the oven to 350° F.
Line a baking sheet with parchment paper. Place the sliced vegetables on the baking sheet and drizzle with olive oil. Add the thyme and season with salt and pepper.
Place in the oven and bake for 35 minutes or until the vegetables are cooked and set aside.
While the vegetables are cooking, beat the eggs in a medium bowl. Add the parsley, paprika, cumin, fontina cheese and salt and let it rest for 1 minute.
Add the vegetables and egg mixture to the pan, decrease the heat to medium low, shake the pan gently to be sure the omelet doesn’t stick and cook about 4 minutes.
Place a large plate on top of the pan. Flip the pan over so that the tortilla transfers to the plate. Very carefully slide the tortilla back to the pan so as to cook the other side and continue cooking for 3 more minutes or until done. Transfer the tortilla to a large plate. Let it rest for 5 minutes and cut into slices. Serve warm or cold, either way is delicious.