Preheat your oven to 425°F (220°C). Wash the sweet potatoes, then slice them into rounds about 1/4 inch thick. They’ll hold up nicely and crisp without drying out.
Toss the rounds with olive oil and a pinch of salt. Arrange in a single layer on a baking sheet lined with parchment for easy cleanup.
Bake for 12–15 minutes, then flip and bake another 5–7 minutes until edges are crisp and centers are tender. If you want extra crispiness, give them a quick broil for 1–2 minutes—watch closely so they don’t burn.
Meanwhile, mix the cream cheese with the yogurt or sour cream and lemon juice. Season lightly with salt and pepper. This base should be creamy and bright, not too runny.
As soon as the rounds come out of the oven, spread a thin layer of the cream cheese mixture on each round while they’re still warm. The residual heat helps soften the spread and makes flavor spread evenly.
Top each round with a slice or two of smoked salmon. If you like, layer on a few avocado slices for creaminess and extra texture.
Garnish with capers, dill, and a final squeeze of lemon. A little extra pepper can bring a nice zing.
Serve immediately, while the rounds are still warm and the salmon is juicy. These are great on a brunch table or as a light starter.