Spray 10-inch (3 L) Bundt pan with nonstick cooking spray; set aside.
In large bowl, whisk together flour, baking powder, cinnamon, baking soda, allspice, nutmeg and salt; set aside.
In large bowl, using electric mixer, beat together butter, sugar and maple syrup until light and fluffy. Beat in eggs, one at a time until smooth. Beat in pumpkin and vanilla until smooth. Stir in flour mixture until well combined. Spread into prepared pan, smooth top and bake in 350°F (180°C) oven for about 50 minutes or until cake tester inserted in centre comes out clean. Let cool in pan on wire rack for 5 minutes. Remove from pan; let cool completely on rack.
In small bowl, whisk together icing sugar and milk until smooth. Whisk in food colouring to tint as desired; pour over top of cake and let stand for 10 minutes. Fill centre with chocolate crumbs and decorate with gummy worms.
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