My boyfriend's ex girlfriend & her whole family is coming to town soon. What should I cook to impress them?

Find things that you could cook in advance, and have some time to be the gracious hostess. Don't choose foods that have to be cooked just before serving. Or choose something that has to be slow cooked. In my world, ham would be a great choice, score it and put pineapple and cherries on it. Make a sauce for it. It can be reheated when needed. Cheesy potatoes, same thing. Cook the potatoes, cut them up, and store them in the refrig. when you are ready, make the cheese sauce, cut up the potatoes, and bake. Roasts are great for this. Prime rib can be browned, and put away for reheating. Lamb chops can be braised, and refrigerated. Clean baking potatoes, put the toppings in bowls, and bake them later. Rather than go fancy, go home cooked. I am eating broccoli, rice and cheese and chicken casserole right now. So good, comfort food. go silly and have a taco bar, with the condiments in bowls. Find mexican side dishes that you like. Lasagna would be yummy, with an Italian meal side choices. And it can be made in advance and refrigerated. But, it has to be brought to room temperature before cooking, or the center of it will never cook. I use allrecipes.com to search for ideas. I choose a meat main dish, and go from there. If your guests are worldly, and would enjoy food from other cultures, go that direction.

Why on earth are you entertaining your boyfriend's ex girlfriend?

Maybe some Pho? Honestly I don't know. You should probably ask your boyfriend what they like or maybe you all could agree on something? I really don't think they would mind what you cook them.. I would look into food that's commonly cooked for guests on google I'm sure you could find something..! Good luck.

You get various types of foods found in internet. Learn and cook for them.