How long does it take to bake a dish at 350 degrees when should be baked 400 for 18 minutes?

You can't simply adjust the baking time proportionally when changing the oven temperature. Here's why:

* Heat Transfer: Lowering the temperature slows down the heat transfer to the food.

* Internal Temperature: The goal is to cook the food to a specific internal temperature, not just for a certain amount of time.

Here's how to approach it:

1. Consider the recipe: Does the recipe offer a lower-temperature alternative?

2. Experimentation: You'll likely need to experiment a bit. Start with a slightly longer time (maybe 20-25 minutes at 350°F), and check for doneness.

3. Use a thermometer: The best way to know if your food is done is to use a meat thermometer.

Remember:

* The type of food and its size also play a role in baking time.

* Don't be afraid to adjust the time in increments based on how the food looks and feels.

Good luck with your baking!