Gradually pour the wet ingredients into the dry ingredients, stirring gently until just combined. Be careful not to overmix; a few lumps are okay.
Gently fold in the raspberries and chocolate chips until evenly distributed throughout the batter.
Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
Place the muffin tin in the preheated oven on the middle rack. Bake at 400ยฐF (200ยฐC) for 5 minutes.
After 5 minutes, reduce the oven temperature to 375ยฐF (190ยฐC) and continue baking for an additional 19 minutes, or until the muffins are golden brown and a toothpick inserted into the center comes out clean.
Remove the muffins from the oven and allow them to cool in the tin for a few minutes before transferring them to a wire rack to cool completely.
Enjoy your delicious homemade Raspberry Chocolate Chip Muffins with a hot cup of โcoffee or tea!