Heat rice and quinoa according to package directions. In large bowl, whisk flour, baking powder, baking soda and salt. In medium bowl, whisk milk and lemon juice. Let stand 5 minutes.
Mash 1/2 banana. Transfer to milk mixture. Add egg and 1 teaspoon maple syrup; stir to combine. Stir in melted butter.
Pour milk mixture over flour mixture. Whisk just until combined; do not overmix. Fold in rice and quinoa. Let batter rest 10-15 minutes.
Preheat large nonstick skillet over medium heat; brush with 1 teaspoon oil. Once skillet is hot, reduce heat to medium-low. In batches, adding oil as necessary, scoop 1 tablespoon batter per pancake into skillet and cook 3-4 minutes, or until bubbles start to form. Flip and cook 1-2 minutes until golden on bottom.
Slice remaining half and full bananas. Serve pancakes with remaining maple syrup, banana slices and cinnamon.