Mexican corn croquettes

Name: Mexican corn croquettes
Prep time: 45 min
Total time: 45 min
Cuisine: American, Mexican, Latin American
Ingredients: 50 g Maizena cornflour; 60 g panko breadcrumbs; 30 g butter; 1 fresh egg yolks; 100 g sour single cream; 2 corn cobs; 1 onions; 2 garlic cloves; 1 limes; ¼ bunch coriander; 1 tbsp mayonnaise; 1 tbsp olive oil; oil; 100 g medium-fine polenta; 1 tsp ground coriander seeds; 1 tsp dried thyme; 1 tsp chilli flakes; 1 tsp salt; ¼ tsp garlic powder; 2 pinch salt