Cheesy Zucchini Casserole

lbs green zucchini (6 medium)

salt (divided (1 tsp for sprinkling and 1/2 tsp for casserole))

cooked white rice*

sour cream ((divided into 2/3 and 1/3))

baking powder

eggs (large)

Mrs Dash seasoning (or your favorite salt-free seasoning)

Colby jack cheese (3 cups shredded (or use Mexican cheese))

chives (chopped, plus more for garnish)