Preheat the oven to 375 degrees F. Line a baking sheet with tin foil. Arrange slices of bacon on lined baking sheet. Bake in the oven for 12 to 15 minutes until crispy. This method makes the crispiest bacon, always.

When bacon is cooked crisp, remove and add to a paper towel to drain. Reserve a teaspoon of bacon grease for the dressing. Roughly chop the bacon.

In a small bowl, whisk together the bacon grease, olive oil, red wine vinegar, salt, and pepper.

Toast the sunflower seeds in a small pan until slightly golden.

Add the spinach, bacon, cranberries, and toasted sunflower seeds to a large bowl. Pour dressing into the bowl and toss to combine. Serve salad right away.