This recipe can be made the morning of or the night before you want to eat it.
If you're starting the night before, mix all of your ingredients and place them in a 9x13 glass pan covered in the refrigerator. Preheat your oven to 350F the next morning. Take your oatmeal bake out of the refrigerator when you start to preheat the oven and place on a warm spot of the stove. The colder your oatmeal bake is when you start to bake it, 5+ minutes may need to be added to the bake time.
If baking right after mixing your ingredients, start by preheating the oven to 350F.
Melt the butter over low to medium heat on the stove top. Then, allow to cool slightly while mixing the rest of your ingredients. Smash the bananas with the back of a fork in your mixing bowl. Add the oats, maple syrup, sourdough starter, cinnamon, eggs, kefir or milk, salt, vanilla, and baking powder. Then, mix in the melted butter. Last, add your nuts.
When all of the ingredients are mixed well together and your oven is preheated to 350F, pour the mixture into a 9x13 baking pan and spread out evenly in the pan.
Bake for 30 to 40 minutes, depending on how cold your oatmeal bake was when you placed it in the oven. If you just took the bake out of the refrigerator before baking, the cooking time will be closer to 40 minutes. The bake is done when the edges are slightly brown and the middle is not jiggly.
Serve with a dollop of yogurt and drizzle of maple syrup.
I hope you enjoy this sourdough banana nut baked oatmeal as much as we do! It's yummy, fills our bellies, and makes for a quick breakfast on a busy day.
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