In small saucepan over medium-low heat, add olive oil, garlic cloves and thyme. Barely simmer 3 minutes and remove from heat.
Using mandolin or knife, thinly slice potatoes and put each kind in separate bowl
Pour half of the olive oil mixture over each bowl and toss potatoes to coat
In muffin tin, layer potatoes, one color at a time until all potatoes are used in each tin, making 12 stacks.Every 2-3 potatoes, salt and pepper each stack.
Bake in oven for 25-30 minutes until tops are beginning to crisp and insides are soft.
Recipe by Dishin & Dishes at https://www.dishinanddishes.com/sweet-and-savory-potato-stacks/