- To prepare the burger mix, in a bowl, toss all ingredients together, pressing the potatoes into the mixture. Add ground cashews. Prepare patties out of that mixture. Preheat oven to 400°F. Lightly spray a baking sheet and place the burgers evenly on the sheet. Bake for 15 minutes and flip the burgers. Continue baking for an another 6 to 8 minutes until both sides are golden. To serve, spread Mango Chutney on both sides of each bun.and place the Pattie and grease tomato ketchup and serve.