Preheat oven to 375 degrees F. Grease a muffin pan with shortening or line with paper liners.: Warm air immediately fills the kitchen as the oven comes to temperature, and anticipating that first whiff is part of the ritual. Preheating ensures a reliable oven spring so the muffins rise quickly and develop a tender crumb; placing batter into a cold oven often yields flat tops. Grease or line the pan so the muffins release cleanly when cooled; if you skip this, you risk tearing the tops when you remove them. A common mistake is not letting the oven fully preheat, which can lengthen bake time and yield dense centers. Listen for the oven to cycle once so you know the temperature is stable.
Whisk together flour, salt, sugar and baking powder. Set the bowl aside.: As you whisk, you will see the dry mixture take on a uniform, pale appearance and feel slightly airy to the touch. Sifting or whisking distributes the baking powder for even lift and ensures the salt and sugar are evenly dispersed. This matters because uneven leavening can create pockets of inconsistent texture. Avoid overworking the dry mixture into a paste; keep it light. A frequent slip up is measuring flour by scooping which compacts it; spoon and level the flour for accuracy.
In the bowl of your stand mixer, mix together the eggs, milk, vanilla and oil until combined. Add flour mixture until just combined. Don’t over mix. Fold in the chocolate chips and frozen raspberries. Fill each muffin tin about 3/4 full.: The wet mix will look glossy as the oil and milk emulsify with the eggs; that sheen signals a cohesive batter. When you add the dry mix, stir until you no longer see streaks of flour, but leave some small lumps so gluten does not overdevelop, which keeps the muffins tender. Folding in the white chocolate chips and frozen raspberries should be done gently so the berries retain shape and the chips do not sink to the bottom. As you portion into the tins, the batter should mound slightly and hold form, which indicates correct thickness. A common error is overmixing, which makes muffins tough, or overfilling tins, which can cause spillover. Use an ice cream scoop for consistent portions.
Bake muffins for 22-25 minutes or until golden. Remove the muffin pan from the oven and place on a cooling rack. Let the muffins cool for 5 minutes before inverting the muffins onto the cooling rack to cool more.: During baking you will notice a gentle aroma of baked flour and warm sugar , and the tops will turn a soft golden color. An inserted toothpick should come out with a few moist crumbs, not wet batter. Cooling briefly in the pan helps the muffins set, then inverting onto a rack lets air circulate so bottoms do not become soggy. Avoid leaving them in the pan too long, which can cause condensation and a damp crust. A common misstep is to cut into them immediately; this releases steam and can make the interior gummy. Let them rest so the crumb finishes baking from residual heat.
Once muffins are still slightly warm, prepare the glaze. Whisk together sugar and milk until smooth. I drizzled about half of the glaze over the muffins and added 1 drop of pink food coloring to the remaining glaze and mixed it well. Drizzle pink glaze over the muffins as well. Let sit for 5-10 more minutes or until glaze is set. Enjoy!: The glaze should be silky and pour slowly from a spoon, coating the back as it falls; that texture ensures it clings to the muffin top instead of running off. Drizzling warm muffins allows the glaze to set with a slight sheen, and the small color flourish makes them feel celebratory. If the glaze is too thin it will run off, so add more confectioner’s sugar to thicken, or more milk if it is too stiff. A typical mistake is glazing very hot muffins; the glaze may melt away, so wait until they are slightly warm. Let the glaze rest undisturbed so it forms a delicate crust, then serve at room temperature for the best texture and flavor balance.