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Set out eggs, yogurt, and eggnog to bring them to room temperature.
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If baking muffins immediately, without refrigeration, position oven rack in center of oven and preheat oven to 475°F.
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Prepare muffin tray by spraying each muffin cup with non-stick cooking spray or greasing individually, ensuring the top of the muffin tin tray is also well-greased/sprayed. Alternatively, the muffin cups can be lined with paper liners.
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In a large bowl, whisk the flours, baking powder, salt, and spices together. Stir in the rolled oats, and raisins and pecans (if using). Make a well in the center of the dry ingredients. Set aside.
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In medium-sized bowl, whisk together the vegetable oil, sugars, eggs, yogurt, eggnog, and vanilla extract. Stir in the pumpkin purée. Mix well.
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Pour the wet ingredients into the dry and stir only until barely incorporated. Do not overmix. At this point, the muffins can be baked or the batter can be covered tightly and refrigerated for up to 8 hours.
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Spoon batter into prepared muffin cups, filling each cup almost to the rim. If batter has been refrigerated for several hours, preheat oven to 475°F and prepare muffin tray cups as above noted. Spoon cold batter into muffin cups; there is no need to bring it back to room temperature.
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Muffins may be baked plain with no toppings or, alternatively, they can be topped with the Crumble Topping (recipe below) or sprinkled with roasted pumpkin seeds.