Preheat oven to 220°C. Scrub and dry the potatoes. With a fork, stab each potato then flip it over and stab on the other side. Microwave the potatoes on high for 10-12 mins, or until nearly tender, but not cooked through.
BAKE POTATOES
Transfer the potatoes to the middle oven rack, spray with oil and season with salt and pepper. Place an oven tray underneath and cook for about 25 mins, until tender.
MAKE SLAW
While the potatoes are baking, add the slaw to a large bowl along with mayonnaise. Toss to combine and season with salt to taste. Drain and rinse the lentils and black beans.
MAKE FILLING
Peel and finely dice onion. When potatoes have 15 minutes of cooking time remaining, heat the oil in a large frypan on high heat. Cook onion for 2-3 mins, until softened. Add Mexican seasoning and cook for 1 min, until fragrant. Add tomato paste, lentils, black beans, corn and stock and simmer on low for about 5 mins, until sauce has thickened. Season to taste with salt and pepper.
ADD CHEESE
Meanwhile, grate cheese. Slice the cooked potatoes halfway through and top with cheese then the filling mixture.
TO SERVE
Divide the Mexican veggie jacket potatoes between plates and top with the sour cream and sweet chilli sauce. Serve the slaw on the side.