Preheat oven to 350F and grease a 9-in cake skillet OR cake pan and set aside. In a large bowl, beat bananas, sugar, butter, milk, eggs, and vanilla until smooth. Fold in flour, baking powder, baking soda, salt, and cinnamon until batter is just combined.
Scrape batter into prepared pan and smooth top. Bake snack cake at 350F 35-40 minutes or until a toothpick inserted in middle comes out clean. Cool cake completely on a wire cooling rack.
Chai Caramel Glaze
In a medium saucepan over medium-high heat, melt butter then whisk in sugar, and agave. Bring sauce to a simmer and stir occasionally until thickened and golden. Reduce heat to medium and add cream, salt, and spices and cook for 1 more minute.
Remove caramel from heat and immediately drizzle over cooled snack cake. Let stand 5 minutes before slicing into wedges. Enjoy!