Make the vinaigrette. In the bowl of a food processor or strong blender, whip all ingredients until emulsified. Pour into an airtight jar or container and set in the fridge until 5 minutes before serving.
Preheat oven to 425 degrees and line two baking sheets with parchment. Stir oregano, garlic, onion, cumin, paprika, and salt with a fork until combined. In a bowl, toss sweet potatoes with half of the seasoning blend as well as honey, 1 tbsp olive oil, and a pinch each of salt and pepper. Spread onto one of the baking sheets and cook for 25 minutes, flipping rounds once halfway through. Set aside to cool.
Meanwhile, cut the tortillas into 1/2 inch strips. No need to be too precise here, however. Toss with 1 tsp olive oil, lime juice, and a pinch of salt. Spread onto the second baking sheet and bake for 8-10 minutes on one side, then flip and bake an additional 5-8 minutes until crispy all over. Watch closely to prevent burning. They will continue to bake a bit on the hot parchment once they're removed from the oven.
Heat 2 tbsp olive oil over medium in a skillet. Add tempeh along with the other half of the seasoning and stir to coat. Cook about 8-10 minutes until tempeh crisps, keeping in mind it will not brown as much as regular meat.
To assemble the salad: Add greens to the bottom of a bowl, then spread sweet potatoes and avocado evenly. Sprinkle with black beans and tempeh, then top with tortilla strips. Drizzle vinaigrette on individual servings.