Preheat the oven to gas 4 / 180C / 350°F and grease a 6"x 8" ovenproof dish
Combine the cookie crumbs, butter and sugar for the base layer together and press into the bottom of the greased dish. I have a lot of gluten-free cookie recipes you can use if you need to, just have a search through my profile
Sprinkle the chocolate chips on top and bake for 5 minutes until the chocolate has melted, then spread it over the top of the base with the back of a spoon
Whisk together the flour, sugar and baking powder then beat in the milk, oil and vanilla until smooth
Fold in the coconut, chopped walnuts and chocolate chips
Pour the batter over the base and return to the oven to bake for 35 - 40 minutes or until a toothpick tests clean
Serve straight out of the oven with ice cream, chocolate sauce and caramel sauce
https://cookpad.com/us/recipes/356864-vickys-magic-shell-for-ice-cream
https://cookpad.com/us/recipes/337671-vickys-coco-choco-ice-cream-gluten-dairy-egg-soy-nut-free
https://cookpad.com/us/recipes/340913-vickys-dairy-free-dulce-du-leche
