Artichoke Leek Frittata

butter

sliced, cleaned leeks, white and light green parts only  (sliced in half lengthwise, then sliced crosswise, about 1/4-inch thick slices) (see How to Clean Leeks)

frozen artichoke hearts, thawed, sliced into 1/2-inch slices

dried tarragon (can sub 2 teaspoons of chopped fresh tarragon, or dried herbes de Provence or dried thyme)

Kosher salt

eggs

small curd cottage cheese (can use ricotta if you prefer)

all purpose flour (omit for gluten-free version)

baking powder

grated Parmesan cheese

Fresh chopped chives or parsley for garnish