Step 1

Preheat the oven to 350°F and line a 12-cup muffin tin with papers.

Step 2

Stir the apple cider, oil, and vanilla together in a small bowl or measuring cup.

Step 3

Stir the flour, oats, brown sugar, baking powder, baking soda, cinnamon, nutmeg, cloves, and salt together in a medium mixing bowl.

Step 4

Pour the apple cider mixture into the bowl with the flour mixture. Stir everything together just until blended.

Step 5

Fold in the apple and walnuts.

Step 6

Divide the batter among the muffin cups.

Step 7

Place the muffin tin into the oven and bake until the tops are set, 20 to 22 minutes.

Step 8

Remove the tin from the oven and transfer it to a cooling rack. Let the muffins cool for at least a few minutes before serving.