My preferences are to minimize stove time. To my mind if you have a stove and a cooler that's luxury and you should have no problems at all. In the mornings I like to just boil a kettle, no stove at lunch, and full on cooking for dinner.
Breakfast. Boil a kettle for tea or instant coffee. Also use the boiling water to make instant oatmeal. Supplement with jam, peanut butter, or cheese on whatever bread/bagel etc you like. A small tub of margarine is probably better than butter in this context. One morning cook bacon. Bacon cooked outside is amazing.
Lunch. Avoid the stove and have sandwiches: jam, peanut butter, or cheese. Avoid presliced "cold cuts" but if you're in Europe and can get fairly hard cured meats they should be fine in the cooler. Also fresh fruit and raw veggies like celery or carrots. On a cool day where you have little to do, make some soup from a package.
Dinner. Anything you want. A chop or steak fried in the pan. Boil and mash some potatoes. A salad. Fry some onions in that pan to make your neighbours crazy. Use some ground meat and canned tomatoes to make a pasta sauce, then set it aside while you boil the pasta. Or make curried beef or chicken and set that aside while you cook rice. Really anything you want is possible. If you have access to a fire, you might want to cook with it but I don't recommend it: you need to learn how to make the fire (you cook on embers, not flames) and it takes up to an hour to get a cook-usable fire, which means lighting it far earlier than you probably want to.
Bring a cutting board and a good knife, plus at least one wooden spoon. Shop every other day because the meat won't keep forever even in a cooler, and you don't have the storage space for a week's worth of fresh vegetables and fruit.