Aunt Suesie's Jello Pinwheel

1 small pkg jello
1/2 cup warm water
1 1/2 cup mini marshmallows
Lightly spray 9" square pan with Pam -Mix jello and water in large mixing bowl. Microwave on high 1 1/2 minutes. Stir to dissolve completely -Add marshmallows to jello-
Microwave on high 1 minute or until all melted- Stir until mixture is smooth-Pour into pan Chill about an hour- Loosen edges with knife -Roll up tightly like into jelly roll -Cut into slices. Use alternating colors for a pretty presentation.