Pistachio Cheesecake Bars

Ingredients:
For the crust:
2 cups digestive biscuit or graham cracker crumbs 8 oz, 250 g
1/2 cup butter, melted 115g
pinch cinnamon powder
For the pistachio cheesecake filling:
1 cup pistachio powder 140 g (just finely ground pistachios)
7 oz softened cream cheese 215 g
8 oz thick cream or table cream 250 g
7 oz sweetened condensed milk 200 g, more if you like it sweeter, about 1/2 a full size can
For the chocolate topping:
1 cup milk chocolate chunks or coverture 170g
handful sliced or crushed pistachios to garnish