Homemade Chex Mix

There was a time Chex Mix was not available pre-made. This is the original recipe. It makes a large quantity.
 
6 oz. pretzel sticks
1 pound blanched salted peanuts
1 pound mixed nuts
6 cups Rice Chex
6 cups Corn Chex

1 1/2 cups melted butter
1/4 cup Worcestershire sauce
1 tablespoon onion powder
1 tablespoon garlic powder
1 tablespoon celery salt

Combine the first five ingredients and set aside.
Combine the remaining ingredients and pour over the first mixture. Stir to coat.
Spread mixture on to a baking sheet and cover with foil. Bake at 225 degrees for 45 minutes.
Uncover and continue to bake 45 minutely occasionally stirring.