Boston Market Creamed Spinach - cooking recipe

Ingredients

1 (10 3/4 ounce) can cream of celery soup
1 tablespoon flour
1/4 cup butter (or margarine or canola oil)
1/2 teaspoon garlic salt (to taste)
1 dash salt, to taste
1 dash pepper, to taste
1 (20 ounce) box frozen chopped spinach (cooked according to package directions & well drained OR 2 pounds fresh spinach, cleaned, stems remo)
1 tablespoon dry onion, chopped (OR 1 small onion, peeled, ends removed, diced)

Preparation

In a large saucepan over medium heat, whisk together celery soup, flour, butter, garlic salt, salt and pepper until smooth and piping hot.
Add cooked and drained spinach and the onion.