Preheat oven to 375°F (190°C) and line a muffin tin with paper liners.
In a bowl, whisk flour, sugar, baking powder, and salt.
In another bowl, mix eggs, melted butter, milk, and vanilla extract.
Pour wet ingredients into dry ingredients and mix until just combined.
Gently fold in diced strawberries.
Divide batter evenly into muffin cups, filling about ¾ full.
Sprinkle brown sugar lightly on top.
Bake for 20–22 minutes until a toothpick inserted comes out clean.
Cool in pan for 5 minutes before transferring to a wire rack.
Serve with a dollop of whipped cream if desired.
