Peel off outer green leaves of the cabbage. Cut cabbage in half making sure to evenly cut the stem. Then cut each half into 4 half moon shaped pieces trying to have a piece of stem attached to each piece for a total of 8 portions.
Preheat the oven for 425 degrees F. Melt butter in the microwave then brush both sides of the cabbage then season with everything but the bagel seasoning.
Brush avocado oil on sheet pan then place cabbage onto the sheet pan. Bake for 25-30 minutes. Test cabbage by poking the stem with a paring knife. If the cabbage feels tender then its done, If it still feels raw continue cooking until tender.
Place cabbage wedges onto a serving tray and pour over leftover butter from sheet pan.