Cheesy Scalloped Potatoes and Ham

medium Yukon Gold Potatoes

butter

yellow onion, thinly sliced

all-purpose flour

+ ½ cups half and half (can sub whole milk or do a combo of both)

Salt/pepper,

shredded cheddar cheese (equal to one 8 oz. block) + ½ cup more for topping

cooked ham, diced

spring fresh thyme

green onions, diced