How to Prep Thanksgiving Side Dishes in Advance
How to Prep Thanksgiving Side Dishes in Advance is a medium American recipe that serves 12. 210 calories per serving. Recipe by Christopher Kimball’s Milk Street on YouTube.
Prep: 45 min | Cook: 30 min | Total: 1 hr 30 min
Cost: $55.77 total, $4.65 per serving
Ingredients
- 2 lb Carrots (ends trimmed, peeled, rinsed, wrapped in paper towels)
- 1 bunch Celery (butt ends trimmed, rinsed, cut in half if long, wrapped in paper towels)
- 1 lb Green Beans (stem ends pinched off, rinsed, wrapped in paper towels)
- 1.5 lb Brussels Sprouts (stem end trimmed, halved if you plan to cut later, otherwise stored whole, wrapped in paper towels)
- 1 bunch Kale (or other leafy greens) (leaves removed from tough stalks, washed, shaken dry, wrapped tightly in paper towels)
- 2 Leeks (root hairs trimmed, bulb left intact, sliced lengthwise, washed thoroughly, wrapped in paper towels)
- 1 bunch Scallions (outer layers removed, washed, wrapped in paper towels)
- 0.25 cup Fresh Herbs (parsley, thyme, sage) (washed, shaken dry, rolled in paper towels, stored in baggie; add fresh to potatoes just before serving)
- 5 Russet Potatoes (peeled, cut into even chunks for boiling)
- 4 Tbsp Unsalted Butter (cut into cubes, added to potatoes while mashing)
- 1 cup Whole Milk or Heavy Cream (warm before adding to potatoes; use milk for lighter mash, cream for richer)
- 1 tsp Salt (season potatoes)
- 0.5 tsp Black Pepper (freshly ground)
Instructions
Wash and Trim All Vegetables
Trim carrot ends, peel carrots, rinse. Trim celery butt ends, rinse and halve if long. Pinch green bean stems, rinse. Cut Brussels sprout stems, halve if you plan to slice later, otherwise leave whole. Remove leafy greens from stalks, wash in a strainer, shake off excess water. Trim leeks, slice lengthwise, wash thoroughly. Remove outer layers of scallions, wash.
Time: PT15M
Package Vegetables for Storage
Wrap each vegetable type in dry paper towels, place in zip‑top baggies. Keep carrots, celery, green beans, Brussels sprouts, and greens together if space allows. Store bags in the refrigerator.
Time: PT5M
Prepare Make‑Ahead Mashed Potatoes
Peel and cut potatoes into 1‑inch cubes. Place in a large pot, cover with cold water, add a pinch of salt, and bring to a boil. Cook until fork‑tender, about 15 minutes. Drain and return to pot. Add butter, warm milk (or cream), salt, and pepper. Mash until smooth and creamy. Let cool to room temperature, then transfer to an airtight container and refrigerate.
Time: PT30M
Reheat Mashed Potatoes on Thanksgiving Day
Transfer chilled mashed potatoes to a saucepan. Add a splash of milk, heat over medium heat, stirring frequently for 5 minutes until steam rises and the mash becomes smooth again. Stir in fresh herbs if desired, then keep hot until serving.
Time: PT5M
Use Pre‑Prepared Vegetables on the Day
When ready to cook, pull the bagged vegetables from the fridge, discard the paper towels, and proceed with your favorite Thanksgiving recipes (roasting, sautéing, steaming, etc.). No additional washing needed.
Time: PT0M
Nutrition Facts
- Calories
- 210
- Protein
- 3 g
- Carbohydrates
- 35 g
- Fat
- 7 g
- Fiber
- 4 g
Dietary info: Vegetarian, Can be made vegan by substituting butter and milk
Allergens: Dairy
Ingredient Substitutions
- Instead of Celery: Celery hearts
- Instead of Green Beans: Snap peas
- Instead of Brussels Sprouts: Mini cabbage
- Instead of Kale (or other leafy greens): Collard greens, Swiss chard, Mustard greens
- Instead of Leeks: Yellow onions
- Instead of Scallions: Green onions
- Instead of Fresh Herbs (parsley, thyme, sage): Dried herbs (use 1/3 amount)
- Instead of Russet Potatoes: Yukon Gold potatoes
- Instead of Unsalted Butter: Margarine, Olive oil (for vegan version)
- Instead of Whole Milk or Heavy Cream: Half‑and‑half, Almond milk (vegan)
- Instead of Salt: Kosher salt
- Instead of Black Pepper: White pepper
Equipment Needed
- Large Pot
- Colander
- Chef's Knife
- Cutting Board
- Zip‑Top Baggies
- Paper Towels
- Mixing Bowl
- Potato Masher
- Baking Dish (optional)
- Stove
- Oven (optional)
Critical Steps — Do Not Skip
- Wash and dry all vegetables thoroughly before storage.
- Wrap vegetables in dry paper towels to absorb excess moisture.
- Cool mashed potatoes completely before sealing the container.
- Reheat mashed potatoes gently, adding milk as needed to restore creaminess.
Chef Tips from the Video
- Add a clove of roasted garlic to the mashed potatoes for extra depth.
- Toss pre‑pped Brussels sprouts with a drizzle of balsamic vinegar before roasting for caramelized flavor.
- Use the same paper towels that wrapped the veggies as a quick wipe for the cutting board to reduce dishwashing.
Troubleshooting
Mashed potatoes are grainy or watery after reheating.
Add a little more warm milk or butter and mash vigorously; avoid over‑boiling the potatoes initially.
Pre‑washed greens become soggy.
Ensure they are thoroughly patted dry with paper towels before sealing; store in a breathable bag if you notice excess moisture.
Storage
Refrigerator: All pre‑washed vegetables and mashed potatoes keep 3‑4 days in airtight containers or sealed baggies.
Freezer: Mashed potatoes can be frozen for up to 2 months; thaw before reheating. Raw vegetables are best used fresh.
Room temperature: Do not store prepared vegetables at room temperature for more than 2 hours.
Make-Ahead Tips
- Prepare all herbs and greens the same day you wash them; they stay fresh longer when dry.
- Label each bag with the date to keep track of freshness.
- Mashed potatoes can be made up to 3 days ahead; reheat gently to avoid drying out.
Frequently Asked Questions
What is the cultural significance and history of vegetable side dishes in American Thanksgiving celebrations?
Vegetable sides like carrots, green beans, Brussels sprouts, and mashed potatoes have become staples of the Thanksgiving feast, reflecting the harvest tradition and the abundance of autumn produce that early settlers celebrated alongside turkey.
What regional variations of mashed potatoes are common in the United States during Thanksgiving?
In the Northeast, mashed potatoes are often made with butter and cream for richness; the South may add sour cream or cheese; the Midwest sometimes mixes in roasted garlic, while the West Coast favors olive oil and fresh herbs for a lighter version.
How is the traditional Thanksgiving vegetable platter served in New England households?
New England families typically serve a mix of roasted carrots, glazed carrots, sautéed green beans with almonds, and butter‑browned Brussels sprouts, often arranged on a large platter for family-style sharing.
What occasions besides Thanksgiving can I use this pre‑prepared vegetable mix for?
The same pre‑washed and pre‑cut vegetables work great for holiday meals like Christmas, Easter brunch, or any family dinner where you want to save prep time and keep the kitchen tidy.
What are the most common mistakes to avoid when making make‑ahead mashed potatoes for Thanksgiving?
Common errors include over‑cooking the potatoes, not cooling them completely before refrigerating, and reheating over high heat which can make them gummy. Cool, store airtight, and reheat gently with a splash of milk.
Why does this Milk Street recipe recommend washing herbs before cutting rather than after?
Washing herbs first removes grit while the leaves are still whole; cutting wet herbs dilutes flavor and makes them harder to dry. Drying them after washing ensures a clean, flavor‑intense herb ready for cooking.
Can I make the mashed potatoes ahead of time and freeze them for Thanksgiving?
Yes, you can freeze the mashed potatoes in an airtight container for up to two months. Thaw in the refrigerator overnight and reheat gently, adding a splash of milk to restore creaminess.
What texture and appearance should I look for when reheating the pre‑made mashed potatoes?
The potatoes should steam lightly, become smooth and glossy, and lose any stiff, cold edges. Stir frequently; the mash should be creamy with no visible lumps.
What does the YouTube channel Christopher Kimball’s Milk Street specialize in?
Christopher Kimball’s Milk Street focuses on modern, globally inspired American cooking, delivering quick, technique‑driven recipes that emphasize flavor, efficiency, and the use of fresh, seasonal ingredients.
How does the Milk Street approach to Thanksgiving side‑dish preparation differ from other cooking channels?
Milk Street emphasizes advance prep, minimal mess, and using simple storage tricks like paper towels and zip‑top baggies, whereas many other channels show everything done on the day, leading to more cleanup and stress.
Last updated: September 4, 2026
