Heat vegetable oil in a large skillet over medium-high heat.

Dice potatoes into small, bite-sized pieces.

Add diced potatoes to the hot oil.

Coat the potatoes in the oil and season generously with salt and pepper.

Let the potatoes cook undisturbed for 5 minutes to allow browning.

Add diced onion and minced garlic to the skillet.

Stir the potatoes, onions, and garlic together and let cook for another 5 minutes.

Add chopped fresh rosemary, garlic powder, seasoning salt, and cayenne pepper to the skillet.

Stir to combine all ingredients.

Continue cooking, stirring every 5 minutes, until the potatoes are tender and slightly crispy on the outside, with browning on most sides.