Cajun chicken pasta

Name: Cajun chicken pasta
Ingredients: 1 tbsp olive oil; 400g chicken breasts, chopped into large chunks; 3 garlic cloves, finely chopped or grated; 2 tbsp Cajun-style seasoning; 400g can chopped tomatoes or passata; 1 chicken stock cube, crumbled; 500g penne or another tube- shaped pasta; 150ml double cream; 20g parmesan, finely grated, plus extra to serve; ½ lemon, juiced; chopped parsley, to serve (optional)