In a large mixing bowl, whisk together your flour, sugar, baking powder, salt, and cinnamon. Keep this mixture dry and don't mix it too thoroughly—you want it kinda loose at this stage. This is where a lot of people mess up by overworking everything together. Just give it a quick stir and move on.
In another bowl, whisk together the milk, egg, melted butter, Greek yogurt, and honey. Make sure everything's well combined so the egg's not sitting in streaks. This step only takes about 30 seconds with a fork, so don't overthink it. The consistency should look smooth and pourable.
Pour the wet ingredients into the dry ingredients and gently fold together until just combined. Here's my golden rule: a few lumps are totally okay and actually keep pancakes fluffy. Don't stir it into smooth batter or you'll end up with dense pancakes—trust me, I've been there. Stop mixing when you see maybe 3-4 small streaks of flour remaining.
Fold in the fresh blueberries carefully so they don't break apart and turn the batter purple. I use a rubber spatula and work gently from the bottom of the bowl upward. Let the batter rest for 2 minutes—this helps the baking powder do its job. Your blueberry pancake recipe batter should look thick and pillowy right now.
Heat a griddle or large skillet over medium heat and grease it with 1 tbsp butter. When you flick a drop of water on the surface, it should sizzle and disappear immediately. If it pools and sits there, your heat's not high enough yet. The griddle's ready when it's hot enough to make butter brown in about 3 seconds.
Pour 1/4 cup batter for each pancake onto the hot griddle, spacing them about 2 inches apart. Don't flip too early—wait until the tops get bubbly and the edges look set, which takes about 2 minutes. Flip once and cook the other side for another 1-2 minutes until golden brown. I always resist the urge to press down, which would squish out all that fluffiness you worked for.
Transfer finished pancakes to a warm plate and keep them in a 200°F oven while you cook the rest. This prevents them from getting cold before everyone's served. Keep cooking until your batter's gone, then serve immediately with your favorite toppings. These blueberry pancakes are best enjoyed fresh and warm.