PUMPKIN WALNUT BARS - Preheat oven to 350 degrees F. Put a parchment paper and spray an 8x8 inch pan with cooking spray. Set aside.

Combine eggs, brown and white sugar, olive oil, melted butter, vanilla and Greek yogurt in a large bowl. Mix it, with electric hand mixer at a medium speed for about a minute, add pumpkin puree and mix some more. Add flour and other dry ingredients and mix until well combined. Finally, add chopped walnuts and mix it. Put the mixture in the already prepared pan and bake for 45 minutes until toothpick inserted in the center of the cake comes out clean, or with a few small crumbs. Cool completely at a room temperature.

CREAM CHEESE FROSTING – Put cream cheese, softened butter, vanilla extract, whipping cream and powdered sugar in a large bowl and mix well with an electric mixer, at a lower speed for about 30 seconds, then at a medium speed for about 30 seconds more. Spread frosting evenly over pumpkin cake and sprinkle with cinnamon.