In a large bowl, whisk together the whole-grain flour, baking powder, coconut sugar, and salt until evenly combined.
Add the cooked quinoa, Greek yogurt, eggs, milk, and 1 teaspoon sunflower oil to the dry ingredients; stir until just combined into a batter.
Let the batter rest for about 30 minutes to thicken and hydrate the flour.
Heat a nonstick skillet or griddle over medium heat and lightly coat it with oil.
Pour about 1/3 cup batter per pancake onto the hot pan and cook until the bottoms are lightly browned, 2–3 minutes.
Flip and cook the pancakes on the other side until cooked through and golden, about 1–2 more minutes. Repeat with remaining batter, adding more oil as needed.
Serve pancakes with sliced bananas or other fruit and drizzle with maple syrup if desired.