This vegetable casserole combines chopped vegetables with tomato sauce, olive oil, and vegetable broth. It bakes covered first to help the vegetables soften, then uncovered to let some moisture evaporate and the exposed vegetables lightly brown.
Choose the vegetable mixture carefully: carrots need smaller pieces than softer vegetables such as zucchini to cook at a similar rate. Check the firmest pieces for tenderness before serving. The basic recipe makes a vegetable side dish. Cooked beans or lentils can turn it into a more substantial variation, but their quantities and preparation should be specified separately.
Start with the Vegetable Cooking Guide:
https://letsveg.com/vegetable-cooking-guide
Video

Vegetable Casserole
Vegetable casserole is a comforting baked dish made with mixed vegetables, tomato sauce, and simple seasoning for easy family meals.
Ingredients
Equipment
Cooking Instructions
- Preheat oven to 375°F (190°C).
- Lightly oil a baking dish.
- Place vegetables in a large bowl.
- Drizzle with olive oil and season with salt and pepper.
- Transfer vegetables to the baking dish.
- Pour tomato sauce and broth over the top.
- Stir gently to combine.
- Cover with foil and bake 25 minutes.
- Remove the foil and bake for another 15-20 minutes, until the firmest vegetable pieces are tender and the sauce has reduced slightly. Continue baking if needed; surface browning alone does not mean the vegetables are cooked through.
- Let rest briefly before serving.
Nutrition
Notes
• Cut firm vegetables, such as carrots, smaller than softer vegetables so they can become tender at a similar time.
• Dry washed vegetables before assembling to avoid adding unnecessary water.
• Keep the dish covered during the first baking stage, then uncover as directed to allow moisture to evaporate.
• Check a piece of the firmest vegetable before removing the casserole from the oven.
• Taste your tomato sauce and broth before adding salt, since both may already be seasoned.
• Use the specified vegetable mixture for the stated cooking time. Different vegetables or frozen mixtures can change the moisture level and baking time.