---
title: Grilled Cheese Sandwich Bar
source:
  name: HelloFresh
  url: https://www.hellofresh.com/recipes/grilled-cheese-sandwich-bar-669560dfb0a47382be870343
servings: 2
prep time: 10 minutes
cook time: 20 minutes
time required: 30 minutes
difficulty: Medium
allergens:
  - Milk
  - Eggs
  - Soy
  - Wheat
tags:
  - Veggie
  - Easy Prep
  - Kid Friendly
  - New
rating: 0.0
rating_count: 0
source_chef: Sara Heilman
review_highlights:
  - theme: Flavor
    text: Many loved the tasty combinations, especially the caramelized onions and garlic mushrooms.
  - theme: Customization
    text: Customers appreciated the DIY aspect, allowing everyone to personalize their sandwiches.
image: "https://images.recipes.furrysalamander.com/grilled-cheese-sandwich-bar.avif"
---
Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce. Cut @potatoes{1.5%lb} into 1⁄2-inch-thick wedges. Halve, peel, and thinly slice @onion{1%unit}. Toss potatoes on a #baking sheet{} with @cooking oil{3%tbsp}, salt, and pepper. Roast until browned and tender ~{25%minutes}. [-- If you added any other items to your meal, you can get started on them now!]

Heat a drizzle of cooking oil in a #large pan{} over medium heat. Add onion, salt, and pepper. Cook, stirring occasionally, until softened and lightly browned ~{10%minutes}. Add 1⁄4 cup water and @sugar{1%tsp} to pan with onion. Cook, stirring, until caramelized and jammy ~{3%minutes}. Turn off heat; transfer to a small serving bowl. Wash out pan.

Meanwhile, using the tip of a spoon, remove and discard black gills from undersides of @portobello mushrooms{4%unit}; trim any large stems if necessary. Halve mushrooms; thinly slice crosswise. Heat a large drizzle of cooking oil in pan used for onion over medium-high heat. Add mushrooms, @garlic powder{1%tsp}, and half the @dried thyme{1%tsp}; season with salt and pepper. Cook, stirring, until browned and tender ~{7%minutes}. Turn off heat; transfer to a small serving bowl. Wipe out pan. While mushrooms cook, thinly slice @tomato{1%unit}. Transfer to a plate; season all over with salt and pepper.

Place @mozzarella cheese{1%cup}, @cheddar cheese{1%cup}, and @honey dijon dressing{2%tbsp} in separate serving bowls. Arrange family style along with jammy onion, garlic mushrooms, tomato, and @sourdough bread{8%slices} for everyone to build their own sandwiches.

Heat @butter{2%tbsp} in pan used for mushrooms over medium heat. Add sandwiches to hot pan. Cook, covered, until bread is golden and butter is absorbed ~{4%minutes}. [-- Lower heat if browning too quickly.] Reduce heat to medium low. Flip sandwiches, adding an additional @butter{1%tbsp} to pan. Cook, covered, until bread is golden and cheese melts ~{4%minutes}.

Halve sandwiches on a diagonal. Serve with potato wedges and any remaining dressing on the side for dipping.