Ooey Gooey Banana Bars are sweet and moist dessert bars that are loaded with bananas and frosted with homemade salted caramel buttercream.
Preheat the oven to 350°F and line a 9x13-inch baking dish with parchment paper.
In a large bowl, using a hand mixer, combine the butter and brown sugar until creamy.
On low speed, add the vanilla and mix until incorporated.
Add the eggs, mixing on low until incorporated.
Add the flour and the salt, mixing well.
Fold in the mashed bananas.
Pour the batter into the prepared pan and bake for 45 minutes, or until the center is set.
Let the bars cool as you prepare the buttercream frosting.
Combine the butter, sugar, salt, and caramel topping in the bowl of a stand mixer fitted with a paddle attachment.
Start mixing on low speed until the sugar is incorporated with the butter.
Increase the mixing speed to high and beat until smooth and fluffy, about 2 minutes.
Adjust the consistency with milk as needed.
Frost the banana bars with the buttercream after they have cooled completely.