Preheat the oven to 375 degrees F (190 degrees C). Grease a muffin tin or line with paper liners.

In a large bowl, whisk together the flour, sugar, baking powder, and salt.

In a separate bowl, mix together the melted butter, egg, milk, and vanilla extract.

Pour the wet ingredients into the dry ingredients and stir until just combined.

Gently fold in the raspberries and chocolate chips.

Scoop the batter into the prepared muffin tin, filling each cup about 3/4 full.

Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted into the center of a muffin comes out clean.

Allow the muffins to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.

Serve and enjoy!