Step #1 There are two essentials for a successful angel food cake: Absolutely grease free preparation & properly beaten whites.
Step #2 Thoroughly wash with hot water & soap a 10-inch tube pan & all equipment and utensils that you will need.
Step #3 Rinse with clean water & leave utensils wet.
Step #4 preheat your trusty oven to 350 degrees.
Step #5 If using a convection oven, preheat to 300F degrees.
Step #6 Into a bowl sift together 1 1/2 c of the confectioners' sugar & the cake flour.
Step #7 Set aside.
Step #8 In a glass or metal bowl (don't use plastic) mix egg whites, salt & cream of tartar.
Step #9 Begin beating at medium speed until whites are foamy and slowly add in the remaining 1 1/2 c of confectioners' sugar.
Step #10 Continue beating just until soft peaks form.
Step #11 Time will vary according to several factors; age & temperature of whites, temperature of your kitchen, & power of your mixer.
Step #12 carefully fold the flour mixture into the beaten whites.
Step #13 as soon as possible pour batter into tube pan & bake in center of oven for 35 to 45 mins, depending on the type of oven, or until a cake tester inserted in center comes out clean.
Step #14 Remove cake from oven & as soon as possible invert pan.
Step #15 Let cool completely in pan.
Step #16 Do not put in the fridge.
Step #17 To remove cake from pan carefully loosen edges with fingers or a thin knife.
Step #18 Invert cake onto cardboard circle or serving plate & push out on bottom of pan.
Step #19 You can pull on the center tube for help.
Step #20 With your hands or a thin knife, carefully ease the cake off of the center tube.