Preheat oven to 350°F.
Line a baking sheet with parchment paper and toast pecans for 7–10 minutes until fragrant.
Cool, chop, and reserve ½ cup for topping.
Reduce oven to 325°F.
Mix 2 tbsp each of oil, flour, and butter-flavored shortening to make a paste and brush inside the cake pan generously.
Sift flour, baking powder, and salt in a bowl and then toss in chopped pecans (minus reserved ½ cup).
In a stand mixer, cream butter, shortening, cream cheese, brown sugar, and sugar for 7–8 minutes.
Add eggs one at a time, scraping bowl between each.
Add vanilla, butter vanilla emulsion, and maple flavoring and mix for 15 seconds, scrape, then mix another minute.
Mix in half of the dry ingredients, then sour cream, then the rest of the dry mix until smooth.
Fold the batter gently to evenly distribute the pecans.
Pour batter into prepared pan.
Bake 1 hour to 1 hour 15–25 minutes, until a toothpick comes out clean.
Cool in the pan for 10 minutes, then invert onto a wire rack and let cool completely.