Remove about 2 ounces of spinach from the freezer and allow it to thaw on the counter, or using the defrost setting on the microwave, thaw the spinach. Wrap the thawed spinach in a kitchen towel and squeeze out as much moisture as possible and set aside.
To a saucepan, add 1/2 pound of sliced or diced American cheese and 1/2 cup heavy cream. Heat on low and stir frequently until melted and thoroughly combined.
Stir in the tomatoes and spinach.
Serve with tortilla chips for dipping.
Notes
Nutrition information does not include tortilla chips
While melting the cheese and heavy cream, stir frequently so that the cheese sauce doesn't burn on the bottom of the pan
Using a double boiler to melt the cheese and heavy cream will ensure that the cheese sauce won't burn on the bottom of the pan
If you don't have a double boiler, a bowl placed over a saucepan that is partially filled with water will work as a double boiler