In a small bowl, combine the softened cream cheese, chopped sage, and thyme. Mix until well blended. Season with salt and pepper to taste.
Lay out four slices of whole grain bread on a clean surface. Spread an even layer of the herb-infused cream cheese mixture on each slice.
On two of the slices of bread, layer the deli turkey breast evenly, followed by a slice of cheddar cheese and a handful of fresh spinach leaves.
Spread a thin layer of Dijon mustard on the remaining two slices of bread. Place these on top of the fillings to form the sandwiches.
Heat olive oil in a skillet over medium heat. Once the oil is shimmering, carefully place the sandwiches in the skillet. Cook for about 3.0 to 4.0 minutes on each side, or until the bread is golden brown and the cheese is melted.
After grilling, remove the sandwiches from the skillet and let them cool for a minute. Cut each sandwich in half for easy packing.
Pack the sandwiches in lunch containers or wrap them in parchment paper for a fresh, convenient lunch option!