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Cream butter, brown sugar, and one egg with an electric mixer on medium speed until fluffy. Add all-purpose flour, baking powder, and salt and continue to beat on medium-low speed until the mixture turns into a dough. Mix in rolled oats.
Making The Cream Cheese Topping
Use a large mixing bowl to beat cream cheese and sugar with an electric mixer on medium speed until smooth. Add eggs and whipping cream and continue to beat until all ingredients are well combined and the batter is creamy.
Assembly and Bake
Transfer the dough to a 9x13 inch baking dish and press it evenly into the bottom of the pan.
Cover the dough with blueberry preserves and sprinkle with fresh blueberries. Pour the cream cheese filling over the blueberries.
Bake for 45 minutes. The edges should be set and slightly puffed while the center still jiggles slightly when the pan is gently shaken.
Allow the cheesecake bars to cool to room temperature, about 1 hour. Transfer to the refrigerator and chill for at least 2 hours before slicing.
Notes
Chill Time
These bars need at least 2 hours in the refrigerator before slicing, but overnight chilling gives the best texture and cleanest cuts. Chill time is not included in the total time.
Cream Cheese
All three packages must be softened to room temperature before mixing. Set them out at least 1 hour ahead. Cold cream cheese creates lumps that won't smooth out.
Don't Overbake
The center should still jiggle slightly when done. The bars firm up completely during cooling and chilling.
Clean Slices
Chill at least 2 hours before cutting. Wipe the knife blade clean between each cut for neat, sharp edges.