Prepare the ingredients as listed.
Toast the sourdough bread slices, if desired, until golden and slightly crisp.
Spread cranberry sauce evenly on one side of each slice of bread.
Layer with baby spinach, deli turkey breast, and brie cheese.
Top with the remaining bread slice. Cut in half.
Combine sparkling water, lemon slices, and chia seeds. Stir well, let sit for 2–3 minutes, then stir again to prevent clumping.
Serve the sandwiches with carrots, hummus, alongside lemon chia sparkling water.