Cut the cauliflower into small florets, then blanch them in lightly salted boiling water for 5 minutes, until slightly tender. Drain and set aside.
Wash the carrot and zucchini, then slice them thinly or dice them into small cubes. Finely chop the onion and garlic.
Heat the olive oil in a skillet over medium heat. Sauté the onion and garlic for 2-3 minutes, until translucent.
Add the carrots and zucchini to the skillet and sauté for 5-7 minutes, until slightly softened.
Dice the tomatoes and add them to the vegetables in the skillet. Season with salt, pepper, and marjoram, then cook for another 5 minutes.
Grease a baking dish with a little olive oil. Layer the pre-cooked cauliflower and the sautéed vegetables into the dish.
In a small bowl, whisk together the plant-based milk and oat flour until smooth. Pour the mixture evenly over the layered vegetables.
Preheat the oven to 350°F (180°C) and bake the cauliflower bake for 25-30 minutes, until the top is lightly browned and the flavors have melded.
Remove from the oven, let it rest for a few minutes, and serve warm, for example, with a light salad.
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