Place a large pan over medium heat and add 1 tbsp olive oil. Then add 12 oz spinach leaves into the pan and cook, stirring occasionally, until the spinach leaves are wilted.
Allow the cooked spinach to cool. When it is cool enough to touch, pour it into a clean dish towel or cheesecloth. Squeeze all of the excess water from the spinach.
In a medium bowl, mix the cooked spinach, 15 oz ricotta cheese, 1 egg, ½ tsp salt, ¼ tsp pepper, ¼ tsp nutmeg, and ½ cup parmesan cheese together.
Set aside as you roll your pasta.
Assemble the Ravioli
When the pasta is done resting, it is time to roll out the dough to assemble your ravioli.
Cut the dough into small sections (about 20).
Pass these sections through the pasta roller on your pasta machine. Because each pasta maker is different I cannot give the numbers of the settings, but choose a thicker setting, then a medium setting, and finally a thin setting (on my Kitchenaid Pasta Maker, I run the pasta through the #1, then #3, then #5, then #7). You want your ravioli pasta to be rolled thinner than you would roll fettuccine noodles. Do not go all the way to the smallest setting, but 1-2 away from the smallest setting should be sufficient. Leave the dough you are not working with wrapped in the saran wrap.
Dust a clean countertop or board with flour. Place a rolled out piece of pasta on the board. Use your ravioli stamp to lightly press an indent into the pasta to mark out the ravioli shapes. You can use this to indicate where to place the filling.
Place about 1½ tsp of filling in the middle of each stamped area. Once all spaces are filled, place another pasta sheet on top.
Use your hands to press the space around the filling to remove any extra air. Then use the ravioli stamps to cut out the ravioli. Repeat this process until all dough and pasta is used up.