I made it for the first time last week (I just omitted the canned chilis), and I piled lettuce up on the side of the plate and put a dollop of sour cream and pico (salsa) on the plate, then just scooped up a serving and put down on the plate too. Think of when you go to a Mexican restaurant and order a dish.
For the boyfriend, I think taco shells or corn chips would be the way to go. The lettuce is great for the SBD because it gives a nice crunchy texture to contrast the taco bake. So my vote would be to give your boyfriend something crunchy to scoop it up with.
We did eat the leftovers the next day, and my husband rolled the taco bake up in a ww tortilla and ate it like a burrito and loved it.
Good luck, and I hope you enjoy it.