Make the buttermilk: In a large mixing bowl, combine the milk and lemon juice. Stir gently and let it sit for about 3 minutes. This creates a quick buttermilk reaction, which helps give the pancakes a soft, fluffy texture.
To the buttermilk mixture, add the mashed banana, Greek yogurt, egg, maple syrup, vanilla extract, and melted butter (or coconut oil). Whisk until smooth and well combined.
In a separate bowl, whisk together the flour, coconut sugar, baking powder, baking soda, salt, and cinnamon so everything is evenly distributed.
Pour the dry ingredients into the wet ingredients and gently fold together with a spatula until just combined. Do not overmix — the batter should be thick, slightly lumpy, and resemble scoopable cake batter.
Let the batter rest for 10 minutes. This allows the flour to fully hydrate and helps create extra thick, fluffy pancakes when cooking.
Fold in the diced strawberries right before cooking, mixing gently to avoid breaking them down or adding excess moisture.
Heat a nonstick skillet or griddle over medium heat and lightly grease if needed. Scoop ~1/4 cup of pancake batter onto the pan and cook until bubbles form on the surface and the edges begin to set. Flip, then reduce heat to medium-low and cook until the pancakes are golden and cooked through. Do not press down on the pancakes — this keeps them tall and fluffy.
Serve warm with homemade strawberry syrup and your favorite toppings like whipped cream, fresh strawberries, mint leaves, or spoonfuls of strawberry pulp for extra flavor and color.