Baking – Convert cooking Shrimp and Vegetables in a foil-packet on a 400 degree grill for 25 – 30 minutes to an oven

Yes. You want it to brown, so I'd do it at about 375 or 400 Fahrenheit. Depending on how thick and wet it is, it could take anywhere from say 20 to 40 minutes. If you have a thermometer, you can figure it is done at say 180 degrees in the center. Otherwise just look for bubbling juices and a nice brown top.

Yes. Use a thermometer. Your lasagna will be done at an internal temperature of 165F (74C). Just lower the baking temp appropriately. I can't know the time and oven temperature that will actually work for you, because you didn't present them, but I hope this helps.