Preheat oven to 350°F and prepare a 9×13 pan by lining with parchment paper or coating with cooking spray.
In a large bowl, mix the butter, sugar and brown sugar. Then stir in the baking soda, salt, flour and oatmeal until combined. Press half of the mixture into the bottom of the pan and bake for 13 minutes.
While the bottom layer is baking, make the filling. Place the cream cheese in a large bowl and stir until smooth. Slowly add the sweetened condensed milk with a whisk to make sure it's mixed well. Then add the orange zest and egg yolk.
Once the bottom layer is done baking, pour the cream cheese mixture over it and carefully spread it out. Add the berries on top of the cream cheese layer. Sprinkle the remaining oatmeal crumble on top and press it down lightly.
Bake for an additional 20-25 minutes or until the edges are golden brown.
Let cool completely before cutting; store in the refrigerator.