In a small saucepan, combine the orange juice, vinegar and honey; season with salt and pepper. Bring to a simmer and cook until thickened, syrupy and reduced by about two-thirds, 8 to 10 minutes. Add the chili powder and refrigerate until cooled completely, about 1 hour.
Arrange the orange and avocado on a round platter, shingling the pieces in a circular formation. Season with salt and pepper. Drizzle the orange vinaigrette over the salad and finish with the extra-virgin olive oil.