Line a 9x5 inch loaf pan with parchment paper and spray with oil. Mash bananas in bowl. Add all liquid ingredients (through milk) and whisk together. Add almond meal, gluten-free flour, oats, baking powder, salt, and cinnamon. Stir until well combined. Bake at 350F for 60-75 minutes, until a toothpick inserted inside comes out more-or-less clean. Cover with foil while baking if the top is browning too quickly. Cool before cutting.