1Heat oven to 350ºF. Lightly spray 9x5-inch loaf pan with cooking spray.
2In large bowl, beat butter and both sugars with electric mixer on medium speed until light and fluffy. Beat in eggs, pumpkin and vanilla. Stir in 1/2 cup coconut and the walnuts. Add flour, baking soda, baking powder and pumpkin pie spice; gently stir in. Pour batter into pan.
3Bake 50 to 60 minutes or until toothpick inserted in center comes out clean. Cool in pan about 10 minutes. Remove from pan to cooling rack. Cool completely, about 1 hour.
4In small microwavable bowl, microwave vanilla baking chips and whipping cream on High in 30-second increments, stirring between microwaving, until mixture is smooth and creamy. If too thick, add small amount of cream. Drizzle over cooled loaf; sprinkle with coconut. Let glaze set before slicing.