1.In a large mixing bowl, combine cream cheese and condensed milk. Use a hand mixer or stand mixer to achieve a smooth,, well-incorporated mixture.
2.Add egg yolk and vanilla essence and mix well. Set it aside.
3.Preheat the oven to 350 F
4.Prepare a baking sheet by lining the parchment paper.
5.In a mixing bowl, beat butter, white,, and brown sugar with a hand or stand mixer until fluffy.
6.Add baking soda and salt and mix to incorporate well.
7.Gradually add flour and oats to form a crumbly mixture.
8.With a spoon, spread half of the oat mixture onto the baking tray. Bake it for 10 to 12 minutes, or until golden.
9.Pour the cream cheese filling over the hot baked crust.
10.Scatter blueberries over the filling.
11.Cover the filling with the rest of the oats crumble mixture by gently pressing it down.
12.Bake the bars for another 20 minutes or until the top is firm and golden.
13.Let the bars cool to room temperature on a wire rack.
14.Now cut the bars to your liking and serve.