1. Prepare the Spread: In a small bowl, mix the softened cream cheese and mustard until well combined. This will create a flavorful, creamy spread for the sandwiches.
2. Prepare the Bread: Lay out the slices of bread on a clean cutting board. Using a sharp knife, trim the crusts from each slice to create neat, even squares. If desired, you can also use a round cookie cutter to create round mini sandwiches.
3. Assemble the Sandwiches: Spread a thin, even layer of the cream cheese and mustard mixture on each slice of bread. On three slices of the prepared bread, place a slice of cheddar cheese, followed by 2 slices of deli ham. Top the ham with a few baby lettuce leaves, making sure to cover the ham evenly.
4. Top and Slice: Place the remaining bread slices on top of the lettuce, spread-side down, to complete the sandwiches. Using a sharp knife, carefully cut each sandwich into four equal parts, creating 12 mini sandwiches.
5. Serve: Arrange the mini sandwiches on a serving platter. For an elegant presentation, you can secure each sandwich with a toothpick or garnish with a small piece of olive or cherry tomato on top. Serve immediately or cover with plastic wrap and refrigerate until ready to serve.

Notes

1. Mustard: Use your favorite type of mustard. Dijon mustard adds a bit of a kick, while honey mustard provides a touch of sweetness. Adjust the quantity to your taste.
2. Bread: Soft, fresh bread works best for these sandwiches. White, whole wheat, or multigrain are all good options. Choose your preferred variety.
3. Cheddar Cheese: Thin slices of cheddar work well, but you can use any type of cheese you like, such as Swiss or gouda.
4. Deli Ham: Opt for good-quality, thinly sliced ham. You can also use turkey, chicken, or a vegetarian alternative.
5. Baby Lettuce: Use any soft lettuce or greens like spinach or arugula for a different flavor profile.