To prepare Baked vegetables in casserole, add oil and sauté the carrot and green beans for 2 minutes, then add in the cauliflower, baby corn and bell peppers to the casserole and saute them again for 2 more minutes. You can sprinkle some salt. 

Add in the mushroom and bell peppers and saute for 1 more minute and keep it aside. Let the crunch the vegetables be and if it is half cooked it is fine. Keep them aside. 

In a bowl, mix flour, milk & water together. Mix well with a balloon whisk.

Heat butter in a Pan. Pour the flour mix and start whisking. The mixture will thicken in a few minutes.

Switch off the heat, add cheese, salt and pepper as per your taste into this batter. Remember there is salt in the veggies and cheese is also salted so add salt accordingly. Taste further and then adjust.

You can also add your dried seasonings like oregano, thyme and dried red chilli flakes. 

The sauce should be of pouring consistency, since it tends to thicken further as it bakes. If your sauce has thickened too much add milk or some water to adjust.

Mix the sauteed veggies into the creamy cheesy batter. 

Now transfer this mixture to an Oven proof casserole. Sprinkle the cheese on top and bake in the Oven for 30 minutes at 220 degrees Celsius.

Serve Baked Vegetables in casserole with Roasted Tomato and Pumpkin Soup or French Onion Soup along with Garlic Bread for a wholesome dinner or lunch.