Wash the asparagus spears and trim. Remove the tough ends.
Place the trimmed asparagus in the slow cooker.
In a small bowl, mix the minced garlic with olive oil. Drizzle the garlic-infused olive oil over the asparagus in the slow cooker, ensuring all spears are coated.
Sprinkle lemon zest, salt, and pepper evenly over the asparagus. Gently toss the asparagus in the slow cooker to coat them evenly with the garlic-infused oil and seasonings. Top with parmesan cheese and dot with butter.
Cover the slow cooker with the lid and cook on low for 1 ½-2 hours or until the asparagus is tender but still slightly crisp. Cooking times may vary depending on your slow cooker, so check for doneness after 1 ½ hours.
Once the asparagus is cooked, transfer it to a serving platter. Drizzle any remaining juices from the slow cooker over the asparagus for added flavor.
If desired, squeeze fresh lemon juice over the asparagus or serve with lemon wedges on the side.
Notes
Refrigerate - Don't worry if you have leftovers you can store them in an airtight container in the fridge for 3-4 days. Freezer - While you can technically freeze cooked asparagus you will need to keep in mind that the texture will change and will be softer. It's best enjoyed fresh. Eat them as a snack, they are the best!Reheat - I've found that the best way to reheat asparagus is by sautéing it in a pan with a little olive oil or butter for 2-3 minutes until warmed through. You can also microwave it for about a minute, but this may result in soggy asparagus. Nobody likes soggy asparagus!!