Start your day on a bright and flavorful note with these lemon curd muffins. The muffin batter is made by combining flour, sugar, baking powder, salt, milk, vegetable oil, and lemon zest until just combined. Fill each muffin cup halfway with batter, then add a spoonful of lemon curd on top. Cover the lemon curd with more batter and bake until golden brown. These lemon curd muffins are moist, tender, and bursting with tangy lemon flavor. Enjoy them warm or at room temperature for a delightful breakfast or snack.