Mash banana with a fork in a small bowl. Try to remove all lumps.
Add egg, chia seeds, and cinnamon, mixing together until well-combined. Let batter sit for at least 5 minutes.
When batter thickens (after 5 minutes), heat large skillet over medium-high heat. Coat pan with oil or nonstick spray. Add 1/4 cup of pancake batter to your pan. Let cook for about 2-3 minutes on both sides, carefully flipping. Repeat until all batter is used. Enjoy warm with pure maple syrup, fresh fruit, and/or nut/seed butter!