Cristina's Killer Dip

Christina's Killer Dip(from Trista)
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1 package ranch dressing mix
1 (8 ounce) package cream cheese, at room temp
1 (8 ounce) container sour cream
1 cup of shredded cheddar cheese, split into 2 1/2 cup portions (I prefer to grate it myself)
1 (8 ounce) package frozen chopped spinach
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Defrost the spinach.Place it in a colander and press it until as much moisture as possible is removed. Mix all ingredients (1/2 of the cheddar), and blend well.Put it in a shallow baking dish (stoneware works best) in the oven for 20 minutes at 350 degrees.Remove from oven.While still hot top it with remaining cheese, heat in oven again for 5 minutes.Remove and cool below lava stage and serve.Goes well with tortilla chips.