Put tortillas on cookie sheets and bake at 350 for 5-10 min till they get crispy
Make Alfredo sauce: melt butter in saucepan add flour stir and cook for 3-4 min till it loses that raw flour smell. Add milk, then seasonings simmer, stirring constantly till thickened and bubbly. Add crab and cheese. Stir to combine. Spread 1/4 of sauce on each tortilla
In sauté pan, melt butter, add oil put in onion and sauté for about 4-5 min till translucent. Add mushrooms and garlic. Sauté another 2-3 min. Add Worcestershire sauce and stir to coat. Put 1/4 of mixture on each pizza.
In same pan melt butter and add oil. Add shrimp, garlic, lemon and seasonings. Sauté till shrimp is pink. Place 1/4 of shrimp on each pizza.
Top pizzas with cheese and cilantro. Bake at 350 for 10-12 min till cheese is melted. Serve hot. Can cut into pieces or serve whole.