Spinach Salad

1/2lb fresh mushroom, sliced
1 red onion
2-3 bunches of spinach (bagged)
1 head of lettuce (romaine)
1/2lb grated Swiss cheese
1 pkg cooked bacon, broken into bite sized pieces (or bacon bits)
1/2 c. chopped celery

Dressing
3/4 C. sugar (Splenda works too)
1 tsp dry mustard
1tsp salt
1 1/2 T poppy seeds
1 C. Oil
1/2 C. apple cider vinegar
1 T. Grated onion

Place all salad ingredients in a bowl. Toss refrigerated dressing over salad and serve.