Grease a 9 x 13 x 2 inch baking pan. Spread marshmallows on bottom; then cake mix batter, then Jello. Drizzle water; don't stir. ... pan for 30 minutes.
Cover bottom of 9 x 13 inch pan with marshmallows. Prepare cake mix according ... marshmallows. Mix dry Jello with pie filling and pour ... and bottom will reverse.