I think this might be the old recipe.

RUBY TUESDAY'S SPINACH Y QUESO DIP
(copycat recipe)

1 jar of either Taco Bell or Frito Lay Salsa y Queso (cheaper brands don't taste the same)
1 package frozen chopped spinach, thawed and excess water squeezed out

Mix together in microwave-safe bowl. Heat through.

Serve with tortilla chips.

Source: FootsieBear

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HOT CHEESY SPINACH DIP
(similar to Ruby Tuesday or TGI Friday's)

1 box frozen chopped spinach, thawed and drained
1 16 oz tub sour cream
1/3 cup mayonnaise
1/2 pkg Knorr Vegetable Soup Mix
1/2 cup cheddar cheese
1/2 cup fresh shredded parmesan cheese (NOT the powdered kind)
Tortilla chips and/or salsa

In mixing bowl, stir together spinach, sour cream, mayonnaise, soup mix, and cheeses. Transfer to casserole dish.

Bake at 350 F for 15-17 minutes. Serve with tortilla chips and salsa, if desired.