Soft Date Cake with Walnuts

Name: Soft Date Cake with Walnuts
Prep time: 5 min
Cook time: 1 h 10 min
Total time: 1 h 10 min
Yield: 12 slices
Ingredients: non-stick cooking spray; 8 all-purpose flour; 3 ½ oz walnut halves; 6 oz pitted dates; 6 oz water; 6 oz sugar; 1 tsp baking powder; 1 tsp baking soda; 1 tsp ground cinnamon; 1 tsp salt; 8 oz unsalted butter; 1 large egg; 1 tsp natural vanilla extract; 5 oz maple syrup