Cheeseburger Dumplings with Crispy Cheese

Name: Cheeseburger Dumplings with Crispy Cheese
Ingredients: For the burger sauce:; 3 tbsp kewpie mayo; 2 tbsp ketchup; 1 tsp yellow mustard; 1 tbsp finely minced cornichons; 1 tsp pickle juice; 1/4 tsp smoked paprika; 1/4 tsp garlic powder; 1/4 tsp cayenne; For the dumplings:; 1 block sharp cheddar, shredded, divided; 1/2-1/4 onion, chopped; 8 oz raw ground beef or Impossible Foods; 1/4 cup cornichons, chopped; 1 tsp salt; Fresh ground pepper; 15-20 dumpling wrappers; 2 tbsp canola or vegetable oil; Chopped scallions for garnish