Preheat the oven to 350ºF (180ºC). Line 12 regular muffin tins with paper liners or butter/spray the pans. The yield can vary depending on the size of the berries.
In a large bowl mix the dry ingredients: sifted flour, baking powder, and salt.
Add the sugars and mix to combine.
In a medium bowl whisk eggs, milk, oil, vanilla, and lukewarm melted butter. Do not beat but mix well until no streaks of egg whites remain.
Add the lemon zest.
Add the mixed wet ingredients at once to the bowl with the dry ingredients.
Mix until you barely have streaks of flour, but do not overmix. It will be lumpy and not completely mixed and that is fine.
Add the raspberries and mix lightly. Be careful not to mash them. I do it with a rubber spatula.
Divide evenly among the muffin cups or muffin liners.
Bake for 25 minutes, until the top is cracked, golden brown, and a cake tester or toothpick inserted in the center comes out clean. Don't overbake.
Let cool on a wire rack and eat warm or let cool down completely, plain, with a dab of butter, and a light drizzle of maple syrup or honey.
They are best eaten the day they are made, but you can keep them for a day at room temperature covered or wrapped.
Store leftovers, covered in plastic wrap or in an airtight container, in the refrigerator for a few days or frozen for a month.