For cream cheese swirl, place cream cheese, eggs, sugar and flour in mixer bowl.
Using a paddle, mix on medium speed 2 minutes. Scrape bowl. Continue to mix on medium speed 2 minutes. Set aside.
For brownie, place Krusteaz Professional Fudge Brownie Mix and water in mixer bowl. If using Ready to Bake Brownie Batter, empty on to a 1/2 sheet pan and spread with a spatula.
Using a paddle, mix on low speed 30 seconds. Scrape bowl. Continue to mix on low speed 30 seconds. If using Ready to Bake Brownie Batter omit this step.
Scale batter into prepared full sheet pan.If using Ready to Bake Brownie Batter omit this step.
Spoon cream cheese swirl randomly over batter in pan. Swirl with end of spoon using large circular motions.
For convection oven, bake at 300°F 30-35 minutes; for standard oven, bake at 350°F 40-45 minutes. Do not overbake.