Begin by dicing the red potatoes into evenly sized cubes, ensuring they cook uniformly. Toss them in a bowl with olive oil, salt, and pepper. Preheat your air fryer to 400°F and arrange the potatoes in a single layer. Cook for 16-18 minutes until golden crisp, shaking halfway through.

While the potatoes are crisping, heat a tablespoon of olive oil in a skillet over medium-low heat. Add the diced onions and cook, stirring often, for 10-15 minutes until softened and beautifully golden brown.

Increase the heat to medium-high and add the ground beef to the skillet used for the onions. Smash the beef into the skillet, cooking for about 5-7 minutes until browned and cooked through. Season with salt and pepper; drain excess fat.

In a small mixing bowl, combine mayonnaise, ketchup, mustard, and Cajun seasoning. Whisk until smooth, adjusting the seasoning as needed.

Assemble your Savory Smash Burger Bowl by layering crispy potatoes as the base, adding smashed beef, followed by caramelized onions. Sprinkle shredded cheese over the warm ingredients, drizzle with sauce, and top with pickles and fresh lettuce.