In a large bowl, add the flour, sugar, baking powder, baking soda, salt, egg, melted butter, vanilla extract, and buttermilk.
Whisk together until you have a thick but clumpy consistency. Do not overmix.
Preheat a griddle or large pan over medium-low to medium heat.
Butter the griddle or pan.
Use a wooden skewer or fork to dunk each strawberry slice into the pancake batter and transfer to the griddle or pan. Repeat until the pan or griddle is filled.
Cook each mini pancake on one side until golden, flip, and repeat on the other side.
Once you've made all the pancakes, enjoy them with maple syrup and powdered sugar.