Strawberry Bar

I bought this pan a year ago and have been wanting to making something with it. But work kept me super busy this past year so I never seemed to find the time make anything. Well yesterday I seen the pan in my pantry and figured I would put it to use. I know I wanted something light and not too sweet and fast. So I used a box strawberry cake mix to start it all off.

1 Box Strawberry cake mix
1 large container Strawberries
Blueberries
2- 3 pkg Knox gelatin (the small packages that come five to a box)
2 cups Heavy whipping cream
1/2 cup sugar
1/2 c powder sugar
1 t vanilla

I am horrible when it comes to making up recipes, I never measure so I pretty much guessed the amounts. You cannot go wrong on the amount. I added more Knox gelatin then I listed above in the one I made I think it was too much in mine so I would suggest 2-3 pkg the most. I would use two next time.
Bake cake as directed on box. Cut while warm and fit into bottom of spring form pan (or you can use any pan)

Mash about 2 cups whole strawberries and add 1/2 cup sugar and knox gelatin and let sit for about 15 minutes while cake is baking. Heat to dissolve gelatin. Cool, when cool whip heavy cream until soft peaks, add powder sugar and vanilla and beat until stiff. When strawberry mix is cool (do not allow to gel) fold in all but one cup of whipped cream. Pour half into pan on top of cooled cake. Remove stems off left over whole berries and arrange in pan along edge. Put blueberries in the center. Fill with remaining strawberry mixture to cover berries. Chill to set. When set decorate top with remaining whipped cream and fruit.