Preheat the oven to 450 degrees and line two large baking sheets with parchment paper. On one, lay out the bell pepper noodles and season with salt, pepper and oregano.Place the artichokes in a medium mixing bowl with the olive oil and season with salt, pepper, and garlic powder. Toss to combine and spread out onto the other baking sheet.Bake the artichokes and bell peppers for 20 minutes.When the artichokes and peppers are done, place them into a large mixing bowl and add in the provolone cheese, olives and basil. Toss to combine thoroughly and then serve over the mixed greens.