Preheat oven to 375 degrees
Line a 9x9 pan with parchment 7 set aside
In mixer bowl - combine cake mix, oats & melted butter - stir on low until fully combined & crumbly
Press ¾ of the mix into your prepared dish making a nice even bottom layer
Top with raspberry jam - spread into even layer
Top with berries
Sprinkle remaining mix over the top - pressing in slightly
Bake 19-25 minutes or until golden brown
Cool completely before cutting
Dust with confectioners sugar if desired before serving