Combine all ingredients for the crust in a large bowl. Cut in the cold butter with a pastry blender, two forks, or your hands until the crust forms small peas and holds together. Press 1/2 – 2/3 of the mixture into a 9 x 13 OR jelly roll pan. Save 1/2 – 1/3 of the crust mixture for a crumble topping.
In a stand mixer or with a hand mixer, cream the softened cream cheese and sugar until smooth. Add the vanilla, cinnamon, and eggs. Beat until incorporated and smooth. Add the diced rhubarb, except 1/4 cup and fold in with a spoon.
Pour filling on top of crust and smooth out. Add the rest of the crust crumble and 1/4 cup rhubarb.
Bake at 350 degrees for 40 – 45 minutes or until bars start to brown over the top.