Preheat oven to 450°F. Place potatoes in a large pot and cover with water. Add a generous pinch of salt to water, and bring to a boil. Simmer until potatoes are tender (approximately 15–20 minutes), then drain and set aside.
Spray a large baking sheet with cooking spray and space potatoes evenly with about an inch of space between them. Then, using a potato masher or large fork, gently press down on each potato until “smashed.”
Combine garlic and butter in a small bowl, then brush generously on each potato. Sprinkle with seasoning mix, salt and pepper.
Bake in preheated oven until potatoes are golden brown and crispy, approximately 25 minutes.
For safe meat preparation, reference the USDA website.