In a large skillet over medium heat, cook the chopped bacon until crispy. Once cooked, remove the bacon and set aside, leaving the drippings in the skillet.
In the skillet with the bacon drippings, add the olive oil, red wine vinegar, Dijon mustard, honey, salt, and black pepper. Whisk until combined and heated through.
In a large bowl, combine the spinach, cherry tomatoes, red onion, and blue cheese. Drizzle the warm dressing over the salad and toss gently.
Top the salad with the crispy bacon and serve immediately.
Notes
This salad is best served immediately to enjoy the contrast of warm dressing with fresh greens.