Whisk together flour, sugar, baking powder, and salt in a large bowl to create a smooth, dry mix.
In a separate bowl, mix together the melted butter, milk, vanilla extract, and egg.
Pour the wet ingredients into the dry mix and stir gently. Fold in the fresh strawberries. Make sure to distribute them evenly.
Heat a non-stick skillet or griddle over medium heat. Lightly grease with butter. For each pancake, pour 1/4 cup of batter onto the skillet. Cook until bubbles form on the surface and the edges look set, about 2-3 minutes.