Start by preheating your oven to 325 degrees and spray two 9 inch cake pans with nonstick spray or line with parchment paper liners.
In a small saucepan, melt together butter, cream and brown sugar over low heat, stirring occasionally. Pour evenly into your two prepared 9 inch cake pans and sprinkle both with equal amounts of the chopped pecans. Set aside.
In a large mixing bowl, combine the yellow cake mix, pumpkin, oil, water, eggs and spices until combined. Beat on medium about 2 minutes. Spoon or pour the batter evenly over the pecan mixture in each of the pans, don't stir them together.. you want the pecans to remain on the bottom of the pan.Bake the cakes for 40-45 minutes or until cake springs back when lightly touched. Cool for 5 minutes. CAREFULLY use a knife to level out top of cake before turning cake pan upside down to remove cake from the pan and moving cake to rack to cool completely. Let cool completely for at least 1 hour or until no longer warm to the touch.
Once cooled, make your cinnamon cream cheese frosting. In a large mixing bowl and using an electric mixer, beat butter and cream cheese until smooth and creamy. Mix in 1-2 tablespoons of milk until you reach the desired consistency for your frosting. Add cinnamon, vanilla and salt to the mixture and then slowly add in the sifted powdered sugar in batches until all has been incorporated.
Place one of the layer cakes, praline side up on your serving platter and spread half of the frosting over the top of it. Add on the second layer of cake, praline side up and spread the remaining half of icing over the top. You can choose to frost the sides of the cake or not but either way, when you are done frosting the cake, add some additional chopped pecans on top.