Place all ingredients except blueberries in your mixer. Mix for 3 minutes, or until completely combined. Gently stir in blueberries.
Bake at 350 for 45 minutes to an hour, or until the top is golden brown and a tester comes out with moist crumbs. Let cool for 10 minutes, and then remove from pan to wire racks to cool.
Combine cream cheese and powdered sugar and mix until smooth. Slowly add lemon juice until your desired consistency is reached. Drizzle over cooled banana bread, and serve immediately.