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How long to cook broccoli and sweet potatoes in the oven depends on how you cut them and the temperature you use.
Generally, broccoli takes about 15 to 20 minutes at 400°F.
Sweet potatoes take longer, usually 25 to 35 minutes at that same temperature when cubed.
If you’re roasting them together, that timing gap is the tricky part you need to plan around.
In this post, we’ll walk through how long to cook broccoli and sweet potatoes in the oven, how to prep them so they finish at the same time, and the best temperatures and techniques for the job.
Let’s get into it.
How Long to Cook Broccoli and Sweet Potatoes in the Oven
Cooking broccoli and sweet potatoes in the oven is simple once you know the timing.
Broccoli and sweet potatoes cook at different speeds, so planning the timing is key to a great result.
Here’s how the timing breaks down so you can cook broccoli and sweet potatoes in the oven perfectly.
1. Broccoli Needs 15 to 20 Minutes at 400°F
When you cook broccoli in the oven at 400°F, it takes about 15 to 20 minutes.
Smaller florets cook faster, closer to 12 to 15 minutes.
Larger florets can take up to 20 minutes.
You’ll know broccoli is done when the edges are crisp and browned and the stems are tender.
This is the quickest part of the equation when you cook broccoli and sweet potatoes in the oven together.
2. Sweet Potatoes Need 25 to 35 Minutes When Cubed
Sweet potatoes take longer because they’re denser.
When you cook sweet potatoes in the oven as one-inch cubes, they need about 25 to 35 minutes at 400°F.
Whole sweet potatoes take 45 to 60 minutes, so cubing is the way to go here.
The smaller your cubes, the faster your sweet potatoes cook in the oven.
3. Together, Plan for 35 Minutes Total
If you want to cook broccoli and sweet potatoes in the oven at the same time, give the sweet potatoes a head start.
Put the sweet potatoes in first for about 15 to 20 minutes.
Then add the broccoli and cook both for another 15 to 20 minutes.
That’s the easiest way to ensure broccoli and sweet potatoes in the oven finish together.
How to Prep Broccoli and Sweet Potatoes for the Oven
Proper prep makes all the difference when you cook broccoli and sweet potatoes in the oven.
Here’s how to set yourself up for success.
1. Cut Sweet Potatoes Into Even One-Inch Cubes
Even cubes are the secret to cooking sweet potatoes evenly in the oven.
If your sweet potato pieces are different sizes, the small ones will burn while the big ones stay raw.
So take an extra minute to cut them all roughly the same size.
2. Keep Broccoli Florets Similar in Size
The same rule applies to broccoli.
Uniform florets cook evenly, which matters when you cook broccoli and sweet potatoes in the oven together.
Cut large crowns into smaller pieces so every floret finishes at the same time.
3. Dry Everything Before It Hits the Pan
Moisture is the enemy of roasting.
If your broccoli and sweet potatoes are wet when they go in the oven, they’ll steam instead of roast.
So pat them dry with a towel before tossing them in oil.
This is a small step that makes a big difference when you cook broccoli and sweet potatoes in the oven.
4. Don’t Crowd the Pan
Give everything room to breathe on the baking sheet.
If the pan is too crowded, the vegetables release steam and never get crispy.
Use two pans if you need to.
Crowding is the most common reason broccoli and sweet potatoes in the oven turn out soggy.
Best Temperature for Cooking Broccoli and Sweet Potatoes in the Oven
400°F is the sweet spot for cooking broccoli and sweet potatoes in the oven.
Here’s why it works so well.
1. High Heat Gives You Crispy Edges
Roasting at 400°F creates that golden, caramelized exterior on your sweet potatoes and crispy edges on your broccoli.
This is what makes broccoli and sweet potatoes cooked in the oven so delicious.
2. Lower Heat Works Too, Just Slower
If you prefer 375°F, that’s fine.
Just add about 5 to 10 minutes to the cook time for both vegetables.
The rule stays the same: cook broccoli and sweet potatoes in the oven at a temperature that gives you the texture you love.
So, How Long to Cook Broccoli and Sweet Potatoes in the Oven?
Broccoli and sweet potatoes take about 35 minutes total in the oven at 400°F.
Give the sweet potatoes a 15 to 20 minute head start, then add the broccoli.
Prep them evenly, keep them dry, and don’t crowd the pan.
Follow these tips, and you’ll nail how long to cook broccoli and sweet potatoes in the oven every single time.