Prepare batter as directed, stirring in only 1/2 cup of the walnuts. Spoon into muffin cups as directed; sprinkle with remaining 1/4 cup walnuts. Bake as directed.
Bake muffins as directed; cool completely. Wrap individually in plastic wrap, then place in freezer-style resealable plastic bag. Freeze up to 1 month. Thaw at room temperature before serving.
Make it Easy
Use an ice cream scoop to scoop the batter into the muffin cups.