Bugs Bunny's Favorite Carrot Casserole

I wanted to make a dish with carrots and found this one recipe lion; Bugs Bunny's Favorite Carrot Casserole.  I think I put too many ritz crackers on the top.  It is a nice side dish we enjoyed it.
I made this dish again on Sept. 1st.  I changed the crackers I put in 15 Ritz and 15 soda crackers.  I liked this ratio so much better.

Bugs Bunny's Favorite Carrot Casserole

Ingredients:

1 pound carrots, peeled

1 small onion

1 cup (2 sticks) butter

1 tablespoon all-purpose flour

1 cup milk

15 Ritz and 15 soda crackers

Directions:

Preheat oven to 350 degrees F.

Serves 6

Cut the carrots into 1-inch pieces and boil till tender. Drain and mash. (May process in blender or food processor for a few seconds.)

Chop onion and saute in half the butter till softened. Do not brown.

Whisk in flour, then milk, and continue cooking till the sauce is thickened.

Add mashed carrots and stir to combine.

Transfer to a buttered [or spray with Pam] 9x13 baking dish. [Can use a smaller, square or round dish to reduce the quantity of topping]

Make topping: crush cracker and mix with remaining butter, melted. Sprinkle topping on carrots.

Bake in preheated oven for 20-30 minutes. If casserole is prepared in advance and refrigerated, increase baking time at least 10 minutes.