In a large mixing bowl, toss the baby spinach, crumbled bacon, thinly sliced red onion, hard boiled egg slices and crumbled blue cheese.
In a resealable glass container, add 3 Tbsp warm bacon drippings with the sugar, spicy or Dijon mustard, red wine vinegar, dried thyme and a pinch of salt and pepper. Shake vigorously.
Pour the warm Bacon Vinaigrette over the salad.
Serve Spinach & Bacon Salad with Bacon Vinaigrette for lunch or light dinner, or as side salad.