Coffee & Walnut Cupcakes

Name: Coffee & Walnut Cupcakes
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: British
Ingredients: 1 tbsp Instant coffee; 1 tbsp Boiling water; 175 g Baking spread or butter (softened, unsalted); 175 g Golden caster sugar (or regular caster sugar); 3 Eggs (large); 1 tsp Coffee extract (optional); 175 g Self raising flour; 65 g Walnuts (chopped); 1 1/2 tbsp Instant coffee; 1 1/2 tbsp Boiling water; 200 g Butter (unsalted, softened); 400 g Icing sugar; 1/2 tsp Coffee extract (optional); 1 tbsp Milk; 12 Walnuts (whole); 2 tbsp Chopped walnuts