Meanwhile slowly heat chicken stock in a pot. Preheat a heavy-bottomed pot or Dutch oven over medium heat, add 30 ml (1 Tbsp) oil.
Add shallots and cook until translucent. Add carnaroli rice and toast, ensure rice is evenly coated in oil. Add thyme. Season with salt.
Deglaze with remaining white wine and reduce until almost dry.
Add chicken stock in small amounts, stirring constantly, adding more as the stock is absorbed. Continue to add stock and stir until rice is al dente, approximately 20 minutes. You may have stock left over.
Remove from heat and stir in cubes of roasted squash, sautéed mushrooms, butter and cheese. Season with salt and red wine vinegar and taste.
Plate over squash purée. Top with freshly-grated grana padano cheese and toasted pumpkin seeds.