Sorry. This may be a little late, but I'd recommend Yia Yia potatoes.
Get yourself a bag of Ruby Sensation red potatoes. Russet works but you want about 1" cubes. Larger potatoes need more cutting. I like the smaller cause when you quarter them all the cubes have skins on them. So the Ruby Sesantions works well for ease of preparation.
Cut potatoes into quarters. Toss them with olive oil, melted butter, salt, pepper, garlic (don't be shy), oregano, and lemon juice. Spread the cubed potatoes on a foiled lined jelly pan (i.e. cookie sheet). May want to Pam the pan. Bake at 400* for apprx 45 minutes till brown. Flip halfway through cooking.
You want them on the crispier side. They are tasty little morsels and are very popular when we do them.
We don't have measurements, but you want the potatoes well coated with all ingredients. We place the potatoes in a bowl and hand toss. When you're done tossing, you'll smell like a real Greek.