Created by Puppitypup on October 23, 2014
Step 1: Preheat oven to 350 degrees and grease a 1 1/2 quart casserole dish.
Step 2: Peel and slice carrots, cover with salted water and bring to a boil, then turn down to simmer, cooking for 15 minutes or until tender. Drain and place in casserole dish.
Step 3: Meanwhile, saute onion in butter over medium heat until translucent. Add flour to onions, cooking a few minutes until flour turns golden.
Step 4: Then whisk in milk, a little at a time, stirring as you go. You may need to turn heat up to medium-high for this step.
Step 5: Add salt, sugar and dry mustard and stir again. Pour sauce over carrots.
Step 6: Combine bread crumbs and melted butter, sprinkle over top of casserole. Bake 25-30 minutes or until heated through.
Step 7: If making ahead, cover and put in fridge, removing 2 hours before serving and increase bake time by 10 minutes or more.