Preheat oven to 350. Grease and flour a 10" Bundt pan. (Or spray with Pam Baker's.)
Cream butter and cream cheese. Gradually add the sugar, beating until light and fluffy. Add eggs, one at a time, beating after each addition. Stir in banana and vanilla.
Combine flour, baking powder & soda. Gradually add to banana mixture, stirring well. The batter at this point will be very thick and almost resemble dough instead of cake batter.
For the topping, combine pecans, sugar and cinnamon. Stir half of the mixture into the batter. Pour half of the batter into pan. Sprinkle with remaining nut mixture. Pour remaining batter into pan.
Bake for 40-45 minutes. Cool in pan 10 minutes and then turn onto a plate. Spoon glaze on top.