First - if you haven't already, invest in a FoodSaver vacuum sealer. They make freezing individual portions easy and protect against freezer burn longer than the ziploc system or plain ziploc bags.
I cook full recipes for myself and freeze leftovers.
Lasagna freezes well in individual servings.
I also freeze shredded chicken breasts made in the crock pot for quick to assemble Mexican meals - I like
this recipe.
It's not frozen but sandwiches and salads are fast if you portion out the meat/cheese/ingredients. I also like Lean Cuisine spa cuisines. They seem less processed than regular lean cuisines. Same with Trader Joe's frozen stuff.