Whole grain all the things. Oats or rye where possible for more beta-glukans(clinically proven to lower LDL). Multi-grain is ideal.
Use lean meats or fish.
Don't sweat it about the dairy. Dairy fat is surprisingly good compared to fats from meat due to the high proportion of the saturated fat that's made up of short or medium chain fatty acids. These don't affect cholesterol and may even improve HDL/LDL ratio on their own. If you throw some pesto on there you get even more healthy fats from the olive oil and choice of nuts in the pesto, as well as a nice little splash of green from basil. Add some salad if you want more greens.
Here's my recipe for an absolutely delicious, and yet healthy and wholesome sammich based on all this.
Multigrain whole grain bread. Pesto, premade or homemade with a nut of your choosing. I really like pistachio or cashew for homemade pesto though it's far too pricey to do every day. Mostly I just use the barilla stuff.
Pre-heated chicken breast, with ehatever spices you like.
A full fat cheese of your liking. My favourites include real buffalo mozzarella(luxury choice) and Jarlsberg(day to day).
Add salad or other veg to your liking, or omit.
Heat in a panini press and enjoy.
Edit after reading: yeah pretty much, though I think they left out some crucial details on how fats work that a lot of people are miseducated about.