Bacon Spinach Salad

5 cups torn spinach leaves
1 cup sliced fresh mushrooms
1/2 cup thin red onion wedges
4 slices bacon, crisply cooked, drained, and crumbled
2 hard-boiled eggs, cut into wedges
1/2 cup Catalina dressing

Toss all ingredients except dressing in large bowl. Add dressing; mix lightly. Serve immediately.