Veggie chilli in jacket potatoes

Name: Veggie chilli in jacket potatoes
Ingredients: 4 baking potatoes; 2 tbsp olive oil plus extra for drizzling; 1 medium onion roughly chopped; 2 celery sticks chopped into small cubes; 2 tsp cumin seeds; 1-2 tsp chilli flakes or to taste; 300g mixed frozen peppers chopped or strips; 2 garlic cloves crushed; 2 tsp hot smoked paprika; 2 x 400g cans mixed beans (or any beans you like), drained; 2 x 400g cans chopped tomatoes; butter to serve; 100g grated cheddar cheese (optional); 200g Greek yogurt; ½ lime juiced; small handful of chopped chives or coriander