Prepare the potatoes by washing them thoroughly and drying them with a towel. Place each potato between two wooden spoons or chopsticks to prevent cutting all the way through.
Carefully slice the potatoes into thin, evenly spaced cuts, about 1/8 inch apart, down to the wooden spoons. This will create the characteristic 'Hasselback' appearance.
In a small bowl, mix the melted butter, minced garlic, olive oil, thyme, salt, and black pepper.
Brush the garlic butter mixture generously over each potato, ensuring that some seeps into the cuts.
Sprinkle Parmesan cheese over the potatoes, making sure it falls into the cuts.
Place the potatoes on a baking sheet lined with parchment paper and bake for about 40-50 minutes, or until they are crispy on the outside and tender on the inside.
Halfway through baking, brush the potatoes with the excess garlic butter mixture again for extra flavor and crispiness.
Once cooked, remove the potatoes from the oven and let them rest for a few minutes.
Garnish with fresh parsley before serving for an added pop of color and flavor.
Notes
For extra flavor, brush with garlic butter halfway through baking.