Preheat the oven to 400°F (205°C) and line a baking sheet with parchment paper.
Rub the potatoes with olive oil, season them with salt, and use a fork to poke a few holes in each. Arrange the potatoes on the baking sheet and bake for 45 minutes or until fork tender.
Once cool enough to handle, peel the potatoes and cut them into cubes. Sprinkle with lemon juice and set aside.
Whisk together the vegan sour cream, vegan mayo, Dijon, and garlic powder.
Combine the potatoes, scallions, vegan cheddar cheese, vegan bacon, and parsley in a large mixing bowl. Add the dressing and toss to coat the potatoes.
Taste the potato salad and season with salt and pepper if needed.
Notes
To store: Store any leftover loaded potato salad in an airtight container in the refrigerator for up to 3 days. If you find the salad has absorbed most of the dressing after storing, you can freshen it up by adding a little more vegan mayo or sour cream before serving again.