MELT butter in 3-quart saucepan; ADD Rice Krispies; STIR until well-coated.
ADD marshmallows; COOK over low heat, stirring constantly, until marshmallows are melted and mixture is syrupy; REMOVE from heat.
PRESS warm mixture evenly and firmly into buttered 13 X 9-inch pan; COOL; CUT into squares.
Per Serving (excluding unknown items): 111 Calories; 4g Fat (31.5% calories from fat); 1g Protein; 18g Carbohydrate; trace Dietary Fiber; 10mg Cholesterol; 162mg Sodium. Exchanges: 1/2 Grain(Starch); 1 Fat; 1/2 Other Carbohydrates.