well living with a cook, ive learned a few things....namely, that im not as good at cooking as my boyfriend. hah.
really though, lasgana is super easy to make, and awesomely tastey, either meat, or a roasted veggie lasgana ( requires a bit more effort, but its sooo worth it )
pasta is also super easy to make, just add some different spices to some canned sauce, basil, oregano, rosemary, cayanne, ...salsa...etc. depending what kind you are making.
fish, also super easy and takes no time to cook, pop it in the oven for like 3 minutes and done! a nice sauce for salmon might be a honey mustard one. or just go with a terriyaki one.