Combine the milk and lemon juice or vinegar in a small bowl and let sit to sour the milk.
In a large bowl, combine the quinoa flakes or oats, flour blend, sugar, baking powder, baking soda, salt, and cinnamon.
Whisk the melted butter and egg into the soured milk. Add this mixture to the flour mixture and stir well. Let batter thicken for several minutes. Add more milk if needed to achieve desired consistency.
Heat a griddle to 375 degrees F or large skillet over medium-low heat. Spray with nonstick cooking spray if needed. For each pancake pour a scant 1/4 cup of batter onto griddle. Flip when they start to bubble. Cook until golden brown. Repeat with remaining batches, spraying the skillet as needed. Makes 6 to 8 pancakes.