I use muffin papers but you could grease muffin pans if you prefer. Depending on how full you make your muffin cups this recipe yields between 22-24 muffins, about 2 dozen.
Mix dry ingredients in a large bowl
Add oil and eggs to dry ingredients and stir until smooth.
Fold in grated carrots until all of them are wet with the batter (it will look like a giant carrot mess with hardly any batter to hold it together just make sure all of the carrots contact batter) then add the nuts if you choose to use them.
Scoop into muffin cups. I use a 1/2 cup measure and fill them all the way since these muffins don't rise very much.
Take out when just starting to brown. This takes about 17-19 minutes in my oven then I turn the oven down to 325 for another 3-5 minutes to make sure the middles get all the way cooked.
Do not eat until cooled at least partially. They are really wet and fall apart when hot but cool to a nice moist but firm texture if you don't over cook them and let them cool most of the way before you eat them. My family has hard time waiting but they are always better 20 minutes later.