Preheat oven to low broil and position rack on second from top position. Slice baguette into 1/2 inch pieces and arrange on baking sheet. Plan for 1-2 per person. Set aside.
Prepare bleu cheese dip by placing bleu cheese, cream cheese, vinegar, olive oil, and pepper in a food processor and mixing until well combined. Drizzle in milk 1 Tbsp at a time while mixing until desired consistency is achieved. It should be thick like frosting. Scoop into a large plastic bag and set aside.
Sauté asparagus and/or red onion in a large saucepan over medium heat until tender. Season with salt and black pepper. To properly caramelize the onions, make sure to keep the lid on to lock in moisture and get them really soft. Set aside.
Prepare balsamic reduction by placing balsamic vinegar in a small saucepan over medium heat, stirring occasionally and being careful not to boil. Cook for about 10 minutes or until the liquid has reduced by about half and a wooden spoon scraped across the bottom leaves a visible line – it should appear somewhat “syrupy.” Pour into a small ramekin for serving.
Pop baguette in the oven and watch closely, toasting until light golden brown. Then remove from the oven, pipe on whipped bleu cheese, and top with sautéed asparagus and/or caramelized onion. Drizzle with balsamic reduction and serve immediately.
*You can use asparagus and/or red onion. *Nutrition information is a rough estimate.