In a medium bowl, toss sliced apples with lemon juice to keep them from browning. In a small bowl, mix warmed peanut butter and ground flax until combined. Lay out the apple slices on a serving tray and drizzle with the warmed peanut butter/flax mixture. Sprinkle mini chocolate chips and seeds over the apple slices, and sprinkle with cinnamon and salt. Serve.