I usually check this forum first for recipes but couldn't find one for a Bechemel Sauce
I have copied this recipe from a Canadian site Béchamel Sauce.

This rich and luscious white sauce is the one found in lasagne and moussaka. It is the base of a great cheese sauce, or for macaroni and cheese. Recipe developed by Valerie Lugonja: A Canadian Foodie.
Yield: 240g                       Prep Time: 5 min.                 Cook Time: 12 min.
Ingredients:
• 1000g milk
• 100g flour
• 60g butter, chopped
• 1 tsp. salt

Instructions:
1.  Place all ingredients into TM bowl; cook for 12 minutes at 90°C on speed 4
2.  Serve
Note:   A fabulous cheese sauce can be made by adding shredded cheese to this recipe after the sauce has cooked for 12 minutes; melt it into the sauce for 1 minute at 90°C on speeds 2-3

This was way too much for 2 people so i halved the recipe and it worked fine.
I also changed the recipe slightly by adding in a handful of grated cheese at the 8 minute mark along with some dried parsley, salt and pepper.

It must have been good because Mandy went for seconds.

Newbie to the forum but I have had my Thermomix for about 6 months now and I love it because I can now cook things that  were previously beyond my skill levels. At this stage I doubt that i can provide anyone with any exciting recipes because i am still learning the basics of cooking but i have enjoyed quite a few of the recipes from the books and look forward to trying some of the recipes that people on the forum have shared. Stay tuned and i hope I can offer something to the forum a bit later.

Dave