Heat oven to 325°F. Spray 12-cup bundt pan with cooking spray. Beat brown sugar, Stevia In The Raw®, oil and eggs until combined. Beat in pumpkin. Add flour, pumpkin pie spice and baking powder; beat on LOW just until mixed. Pour into prepared pan.
Bake 60 to 70 minutes until toothpick inserted in center comes out clean. Let stand 15 minutes. Run knife around sides of pan to loosen cake; remove from pan to wire rack. Cool completely, about 1 hour.
Meanwhile, combine caramel and bourbon in a small bowl. Drizzle over cooled cake and sprinkle with pecans.