Turn the instapot onto "saute" mode, add oil. Dice the onion, chop the zucchini, carrots and pepper into small pieces. Add vegetables (except spinach) to the instapot, season with salt & pepper, Let cook for several minutes, stirring occasionally.
Add Ground Beef and continue stirring occasionally until the beef is mostly browned, about 5 minutes. Add spices and salsa, stir until ingredients are combined well.
Place top on pressure cooker, make sure it is in "sealing mode". Turn instapot to manual pressure cooking mode on 'normal' pressure. Set for 15 minutes. Let pressure naturally release for a few minutes, before using quick release to dissipate remaining pressure. Stir in Spinach, until it is wilted.
Serve in tacos with your favorite toppings like cheese, sour cream, olives, lettuce, whatever your heart desires. To keep it Whole 30/Keto/Paleo eat on its own, or turn into a bowl over cauliflower rice.