Prepare salmon by dumping the can in a medium sized bowl.
Mix the salmon, mayonnaise, yellow mustard, black pepper, and garlic powder. Mash all of the ingredients together and shape into round patties. Set aside.
Next, in a large skillet melt the margarine over medium heat and add French bread cubes.
Toss the bread cubes in the skillet and sprinkle 1/4 tsp. of the garlic powder.
Next, assemble the salad by adding the spinach, apple, carrot, red onion, cranberries, French bread croutons, and cheese in a large bowl.
Toss salad and set side.
In a skillet that you used for preparing the croutons, lightly brown the salmon patties on both sides over medium heat (turn them 3-4 times and press with the spatula to ensure that they are cooked well on the inside).
Remove from heat and split each pattie in fourths.
Place salmon bites on top of the salad. Drizzle the dressing over the salad.