Remove the basil leaves from the thick stalks. Add basil to the food processor.
Add the lemon juice, olive oil, salt and garlic powder to the basil in the food processor. Process on high about 1 minute to break up the basil well.
Add the spinach to the food processor and process on high about 1 minute to incorporate the spinach with the basil.
Rinse and drain the can of white beans. Add the drained white beans to the food processor and process on high 1-2 minutes, scraping down the sides as needed.
Test the texture and consistency of the white bean pesto. It will continue to thicken as it sits. If you want a thinner sauce, add water 1-2 tbsp. at a time and process again until you have the right consistency.
