One of my favorite "healthy" substitutes? Baked chicken/veal/pork parmesan (or schnitzel). Pound your meat of choice (hehehehehe) thin, salt and pepper it, seasoned flour dredge, egg dunk, and second dredge, this time in seasoned bread or panko crumbs, then bake it instead of frying. I have a sprayer of sorts that I use for olive oil, so it will just give a very light coating (Misto makes one - you can get them through Amazon). Spray the sheet pan, spray the tops, bake at 375 - 425F until browned. If you do it parm style, heat tomato sauce of your choice to put over the top, then use long, thin curls of parmesan on top for an extra flavor punch, without a lot of cheese. Serve with spaghetti squash, protein pasta (and follow serving recommendations for pasta), or zoodles.
Or, if you go the German route, with homemade spaetzle (I make mine with egg, so it covers the "must have protein" requirement of my carbs :)), and a mushroom gravy (or sauteed mushrooms).
Another healthier fave is white chicken chili - great for leftover roasted chicken. Shred leftover chicken of your choosing (I use whatever meat is left - breast, thigh, etc), and toss it in chicken broth or stock (homemade if you have it, canned/boxed works just as well). I generally do the meat equivalent of a quarter chicken and two, liter boxes of stock. Add a can of white beans (cannellini beans work), a chopped onion, and some rice (half cup to 3/4 or so). Add some diced, roasted green chilis (we can get them in small cans in the grocery stores here...or in my neck of the woods, roasted hatch chilis). Simmer until the rice is tender. For seasoning, since it's Mexican-ish, I use salt, pepper, cumin, chiltepins (if I have them) or chili flakes, garlic, and whatever else jumps in from the spice cabinet. I add hot sauce as well (I like my heat!). Once the rice is cooked, I add some milk for creaminess, and you can thicken it with a roux or a bit of cornstarch slurry. To serve, top each bowl with some tortilla chips (just a few - it adds just a little crunch and flavor), cubed avocado (good fat!), a bit of sour cream or plain greek yogurt, chopped fresh cilantro, and more hot sauce if so inclined. Also, a squirt of fresh lime.
A go-to comfort food around my house, that still isn't terrible for you, is kielbasa with sauerkraut, and served with potatoes (with their skins!) of some sort, or (the less healthy, carb-heavy option) pierogi. Baked fries make a good potato option, or baked potatoes (with their skins). When they're available, new or fingerling potatoes (multicolored are available here, love them!), tossed in olive oil, salt, and pepper, and roasted until they're crispy-ish and cooked through.
I love to cook, can you tell?
Anyway, the key for me for healthy foods was: pick a protein, preferably lean, and make a serving or two the centerpiece, and then build around that. Have more vegetables than starch. Don't be afraid of fat, but don't drown the meal in it, either. Use fats like olive oil, or butter. I'm a real butter proponent, rather than margarine or the "I Can't Believe It's Not...." fake varieties. European/cultured butter is AMAZING and adds great flavor. Making homemade dressings, aoli and mayonnaise for salads and sides can make all the difference. Other cultured/fermented foods added to your diet are also a good idea - yogurt, pickles, sauerkraut (and other nationalities' varieties like kimchee). Keep healthy snacks on hand so crisps and candy aren't the first go-to. Chocolate, though, too, isn't necessarily bad - just keep darker chocolate with high cocoa content around, instead of mass market candy bars. Nuts, fruits (even canned in juice - it's handy and sweet and good), cubes of cheese...etc.
Something I've found too is...don't try TOO hard to make a favorite dish "healthy." Find other ways to enjoy healthy foods - that is, go ahead, replace a burger with a veggie burger, but don't expect it to be a burger. Enjoy it for what it is - a new dish (another favorite in our house - "The Hypocrite:" a veggie burger with bacon and cheese....:whistling:). Vegetarian lasagna is wonderful in its own right, no need to try to make it replace meat lasagna. *steps off food soapbox*