1 Stir in flour a little at a time until smooth, then remove from heat. 2  Add broth and milk a little at a time, stirring to keep mixture smooth. 3  Then, stir in mushrooms. 4  Return to heat and bring sauce to a gentle boil; stir constantly until sauce thickens.
A pound is equal to 16 ounces. If 20 slices equals 1 pound equals 16 ounces, then 1 slice is equal to 16 oz / 20 = .8 ounces. 1 pound = 16 oz = 20 slices. 16/20 oz per slice.
Low-fat cheese is lower in calories than full-fat cheeses. A 1-oz. slice of Cheddar cheese provides 114 calories, but 1-oz. of low-fat Cheddar contains 48 calories. One ounce of American cheese has 105 calories; whereas the low-fat variety has 51 calories.