Prepare the Oven and Muffin Pan: Start by preheating the oven to 350°F (175°C). Line a muffin tin with paper liners or lightly grease each cup so the muffins release easily after baking. Setting everything up first keeps the baking process smooth and stress-free.
Mix the Dry Ingredients: In a medium mixing bowl, whisk together the gluten-free flour, baking powder, baking soda, salt, cinnamon, and nutmeg. This step spreads the spices and leavening evenly so each muffin bakes with the same flavor and texture.
Combine the Wet Ingredients: In another large bowl, whisk the eggs, brown sugar, and granulated sugar until smooth and slightly glossy. Add the oil, milk, and vanilla extract, then mix again until the batter looks silky and well blended.
Fold the Batter Together: Slowly add the dry ingredients into the wet mixture while stirring gently. Mix only until combined, since overmixing gluten-free batter can affect the texture. The batter should look smooth but slightly thick.
Add the Carrots and Optional Mix-Ins: Fold the grated carrots into the batter until evenly distributed. If you like extra texture, gently stir in walnuts, raisins, or coconut at this stage. The batter will look speckled with carrots and smell wonderfully spiced.
Fill the Muffin Cups: Spoon the batter into the prepared muffin tin, filling each cup about three-quarters full. This allows enough room for the muffins to rise without spilling over the edges.
Bake the Muffins: Place the muffin tin in the oven and bake for about 18–22 minutes. The tops should look lightly golden and a toothpick inserted in the center should come out clean.
Make the Cream Cheese Icing: While the muffins cool, beat the cream cheese and butter together until smooth and creamy. Add powdered sugar and vanilla, then mix again until fluffy. Stir in a small splash of milk if the icing feels too thick. Spread or drizzle the icing over completely cooled muffins.
