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Prepare the pan and oven
Preheat the oven to 356°F (180°C / 160°C fan).
Grease a 9x13 inch (33 × 23 cm) rimmed baking pan and line with parchment paper, then lightly grease again.
Prepare the vegetables
Add the grated potatoes, carrots, spinach, bell pepper, and chives to a large bowl and mix to combine.
Make the egg mixture
In a separate bowl, whisk together the eggs, milk, and oil.
Add the baking powder, salt, pepper, and flour. Whisk until smooth.
Combine and bake
Pour the egg mixture over the vegetables and mix to combine
Transfer to the prepared pan and spread evenly. Sprinkle with cheese and sesame seeds (if using). Bake for about 20 minutes.
To check if baked: The center should be set and not move when you gently shake the pan. If it does, bake a few more minutes.
Let cool for 2–3 minutes before slicing and serving. Serve on its own, or between slices of no-knead bread, on an English muffin, or wrapped in a soft homemade tortilla.
Vegetable mixture: Avoid adding too many vegetables, as excess moisture can prevent the eggs from setting properly.