Vegan Biscoff Cake (Eggless)

Name: Vegan Biscoff Cake (Eggless)
Prep time: 1 h
Cook time: 18 min
Total time: 1 h 18 min
Cuisine: European, British
Ingredients: 315 ml Unsweetened soy milk ((1+¼ cups)); 1 Tablespoon Apple cider vinegar ((sub white vinegar or lemon juice)); 350 g Self-raising flour ((2+⅔ cups)); 1 Teaspoon Bicarbonate of soda; 1 Teaspoon Ground cinnamon ((optional)); 200 g Caster sugar ((1 cup)); 180 g Dairy-free margarine, melted ((¾ cup)); 1 Teaspoon Vanilla extract; 10 Biscoff biscuits, crushed into crumbs; 250 g Dairy-free margarine ((1 cup)); 250 g Smooth Biscoff spread ((1 cup)); 500 g Icing sugar ((4 cups)); 8 Biscoff biscuits; 1 Tablespoon Smooth Biscoff spread