In a bowl, mix the flour, powdered sugar, baking powder and salt.
In another container, quickly mix the eggs, milk, oil, melted butter and vanilla.
Incorporate the dry ingredients into the liquid ingredients in three batches, using a whisk to start then a spatula when the dough thickens. Do not mix more than necessary: just enough to no longer see any flour.
Finally add the raspberries and white chocolate chips, taking care to keep a little of each for decoration.
Let the dough rest as is, at room temperature for 30 minutes. This will allow the muffins to rise nicely.
Preheat the oven to 220° traditional heat. Cooking is done in two batches. Place 6 paper cases in your muffin tin, leaving empty space between each (hot air needs to circulate for better baking).
Using an ice cream scoop to make it easier, fill each box with dough to the top (see my photo). Finally add a few raspberries and a few sprinkles on top. Sprinkle with a little brown sugar.
Bake first for 7 minutes at 220° then reduce to 180° without opening the oven door, for a duration of 20-22 minutes. This varies depending on the oven. The muffins should be nicely browned. You need to test for good cooking using a wooden pick: if it comes out dry or with a few crumbs then it is cooked.
Wait 15 minutes before unmolding the muffins, placing them on a rack to cool.
Notes
These white chocolate raspberry muffins will keep at room temperature, in an airtight container for about 4-5 days or in the refrigerator for up to 1 week.