Cream the butter with the sugar, then mix in the eggs one at a time.
Mix flour with cinnamon and baking powder and stir into the egg mixture.
Stir in the nuts and white chocolate chips.
Place paper liners into jumbo muffin cups.
Spray liners with canola oil cooking spray.
Bake at 350°F for 45 minutes until golden brown, and a toothpick inserted comes out clean.