Heat the dutch oven over medium. Fry the bacon in the dutch oven until crispy. Remove the bacon and place on a paper towel lined plate to drain and cool.
Add carrots, celery, and onions to the bacon grease in the dutch oven. Sauté until soft. Add the garlic and cook for an additional minute.
Mix the flour into the vegetables and cook for about 2-3 minutes.
Add the beer and stir, scraping the bottom of the pot to make sure nothing is sticking to the bottom.
Pour the chicken broth into the pot and stir.
Season with salt, pepper, dijon, worcestershire, and cayenne.
Allow the vegetables to simmer in the broth and beer for 30 minutes so they become very soft and the spices meld into the soup.
Using the immersion blender, blend the vegetables until it all becomes a liquid.
Whisk the cream into the pot and remove from the heat.
Slowly whisk in about a half cup of cheese at a time and stir until all the cheese is added and melted.
Serve immediately with crushed pretzels and crumbled bacon on top.