Place sliced yellow squash and the white parts of the scallions (save the green for garnish) in the skillet spray with cooking oil and season with bbq dry rub, toss the squash so evenly coated with seasoning and roast for 25-30 minutes until squash is slightly tender.
Drain off excess liquid in the skillet and let cool for 5 minutes. Blend together Eggs, Milk, Mayo, Melted Butter, ½ cup cheddar cheese and ½ a sleeve of crushed ritz crackers. Tmixture doesnt need to be pureed it can still have some texture and a few lumps.
Pour Mixture over the squash and stir mixture so its evenly coated. Wipe down the sides of the skillet so the sauce doesnt burn. Top with remaining crushed Ritz Cracker and Shredded cheddar. Spray with cooking oil then Bake for 25-30 Minutes until golden brown and bubbly.
Garnish with sliced green scallions and a pinch of bbq dry rub.