Preheat oven to 180C.
In an oven-proof casserole dish, melt butter over medium heat. Add onion and garlic and cook for 5 minutes or until soft. Add rice and cook until it becomes translucent, then add wine and increase heat to medium-high. Cook until all the liquid has evaporated.
Add stock and milk and bring to a simmer, cover and transfer to oven. Bake for 30 minutes or until all liquid is absorbed and rice is tender. Remove from oven and allow to cool.
Combine Chilli Cheese ingredients in a bowl. Add Chill Cheese mix to the cooled rice and mix to combine. Cover and place in the fridge for at least 2 hours, preferably overnight.
Make the coating by mixing together flour, salt and pepper in a shallow bowl. Put eggs in a second bowl and panko crumbs in a third bowl.
Scoop out large spoonfuls of the rice mixture and roll them into balls. Coat the balls in the flour mix, then the eggs and then the crumbs.
Cook balls by adding vegetable oil to a frying pan to a depth of about 2.5 centimetres. Heat oil over medium-high heat. Cook balls in the oil in batches, turning frequently so that they cook evenly. Remove when they are a deep golden brown. Drain on paper towel.