For the pesto: In a food processor, add the kale, nuts, Parmesan, lemon juice, garlic, salt and pepper. Pulse several times until the mixture is chopped but still chunky. Scrape down the sides, and then turn the processor on and drizzle the oil through the feed tube. (For use with this pizza, I like to add just enough oil to make a spreadable pesto. You may thin leftovers, if desired, with more oil, pasta cooking water, a little white wine or broth.) Process until the pesto reaches your desired consistency, stopping to scrape down the sides as necessary. At this point the pesto is ready to go, but it may be refrigerated until ready to use and freezes well, too. The flavor will improve over time. Tip: When you remove the pesto from the processor, stir in any lemon juice or residual olive oil that may have seeped under the blade.
For the pizza: Preheat the oven to 425℉. If you’re using store-bought dough, check the instructions on the package. It might need to rest at room temperature prior to baking.
Prepare the pizza dough as directed, whether store-bought or homemade. I like to roll the dough most of the way between pieces of parchment paper and then transfer it to my 12-inch pizza pan and gently stretch to the edges of the pan. Alternatively, a 12-inch cast iron skillet or a baking sheet may be used. Or follow the directions for a pizza stone if you have one. Helpful hint: if you roll the dough in the parchment too much, it will stick; spraying the parchment lightly with cooking spray will help. For best results, roll or stretch the dough as evenly and thinly as possible.
Par-cook the crust for 4-5 minutes. Allow it to cool for a few minutes, and then spread an even layer of pesto across the surface of the dough. You will use roughly half of the pesto. (Use the rest for another pizza or as you would any basil pesto. It freezes well, too.)
Sprinkle the cheese over the top. Finally, in a small bowl, toss the 1 cup chopped kale with the 1 teaspoon of olive oil and a sprinkle of salt. Rub the oil into the kale so it’s lightly covered. Stir in the mushrooms and toss to lightly coat if using. Distribute the kale mixture evenly over the top of the pizza. When using mushrooms, arrange them on top of the kale.
Place the pizza back in the oven, and bake until the crust is golden in spots, the cheese is melted, and the kale has a few crisp edges (about 12 minutes, give or take a few, on a metal pizza pan or baking sheet—check sooner if using a baking stone). If desired, top the pizza with a light sprinkle of red pepper flakes. Slice and enjoy.