Cheddar Broccoli Potato-Top Bake
Crisp-Topped and Potato Comfort
One 8×12 in (20×30 cm) baking dish, at least 3 qt/2.8 L; 4 main-dish portions · Active 30 min · Total 1 hr 15 min
Broccoli holds its shape beneath a rough, golden potato roof when the filling is thick before assembly. White beans give the vegetable layer enough substance for supper, while sharp cheddar goes into the sauce instead of forming a rubbery lid. This is a good pan for a smaller table: four generous spooned portions, with no second starch needed.

Steam the florets, then let them breathe
Cut the broccoli into small, similar florets and peel the thick stem before dicing it. The stem belongs in the pan a little earlier because it is firmer. A brief steam takes away the raw crunch without making the florets collapse. Spread the cooked broccoli on a plate so trapped steam can escape while you make the sauce. Water hidden between hot florets is enough to turn an otherwise sound cheese sauce thin. The oven stage should finish a prepared filling, not struggle to cook a mound of raw broccoli under potatoes.
Mash for a topping rather than a purée
Drain the potatoes thoroughly and return them to the warm pan briefly. A hand masher leaves a little texture and avoids the gluey result that a food processor can produce. Keep the mash soft enough to spoon in small mounds; a stiff block dragged across the dish can pull the broccoli into the topping. Join the mounds with the back of a fork and leave shallow ridges. Their high points brown first and make a useful contrast with the creamy layer underneath.
Choose a cheese that carries its weight
A mature cheddar gives the sauce flavor without needing a huge quantity. Stir it in after taking the sauce off the heat, then fold through the beans and broccoli gently. The sauce should cling to a spoon before it goes into the dish. Rest the finished bake for five minutes so the layers settle, but serve it as a generous spooned supper rather than promising tidy pie slices. For a gathering, bring this hot or properly chilled for reheating; a browned potato surface does not protect the filling during a long warm journey.
Ingredients
- 1 lb 5 oz floury potatoes, peeled and cut in 1-in/2.5-cm pieces (600 g prepared)
- 6 cups water (1.4 L), for potatoes
- 2 tablespoons butter (30 g), divided equally between mash and sauce
- 1 1/4 cups milk (300 ml), divided: 1/4 cup/60 ml for mash and 1 cup/240 ml for sauce
- 1 lb broccoli (450 g prepared florets and peeled stem)
- 1 cup water (240 ml), for steaming
- 2 tablespoons all-purpose flour (18 g)
- 1 teaspoon Dijon mustard (5 g)
- 3 1/2 oz mature cheddar, grated (100 g)
- 1 can white beans, drained and rinsed (8 1/2 oz/240 g drained)
- 1/4 teaspoon fine salt (1.5 g), divided equally between potatoes and sauce
- 1/4 teaspoon black pepper
Set out
Oven, 8×12 in (20×30 cm) baking dish, at least 3 qt/2.8 L, Large saucepan, Steamer basket and covered pan, Medium saucepan, Whisk, Potato masher, Food thermometer, Rimmed baking sheet, Suitable foil if the topping colors before the center finishes
Allergens
Milk, Wheat, Mustard; check Dijon labels. Check labels and substitutions.
Make it
- Heat the oven to 400°F (205°C). Set the baking dish on the rimmed sheet. Put potatoes in the large saucepan with their water, bring to a boil and simmer 15–18 minutes until easily pierced. Drain, return to the warm pan for 1 minute, then mash with 15 g butter, 60 ml milk and half the salt.
- Meanwhile cut broccoli stem into 1/2-in/1-cm dice and florets into 1 1/2-in/4-cm pieces. Bring steaming water to a simmer. Steam stem for 2 minutes, add florets and steam 3 minutes more until nearly tender. Spread on a plate to release steam.
- Melt the remaining 15 g butter in the medium pan. Stir in flour for 1 minute, then gradually whisk in the remaining 240 ml milk. Simmer 3–4 minutes, stirring, until it coats a spoon. Take off the heat and stir in mustard, cheddar, remaining salt and pepper. Fold in beans and broccoli.
- Spread the warm filling in the dish. Spoon mash over it in small mounds, join them gently and roughen with a fork. Bake 25–30 minutes until the ridges are golden and the center and several other spots reach 165°F (74°C). If necessary, cover loosely with foil while the center finishes.
- Rest 5 minutes and divide into four generous portions.
A vegetable supper with enough texture
Keep a few florets visible at the cut edge rather than stirring until the filling becomes uniformly green. The beans, intact broccoli and forked potato roof give each spoonful a different texture.
A useful detail
The potato and broccoli preparation overlap. The 75-minute total includes preparation, sauce, up to 30 minutes baking and a 5-minute rest. The baking dish needs room above the filling; do not pack it to the rim.
Another way
- Replace broccoli with 450 g prepared cauliflower, steaming its small florets for 6–8 minutes until nearly tender. Keep the same beans, sauce and final 165°F (74°C) endpoint.
Keep it well
Divide leftovers into shallow portions and refrigerate within 2 hours, or 1 hour above 90°F (32°C), at 40°F (4°C) or below. Use within 3 days, respecting earlier ingredient deadlines. Reheat to 165°F (74°C) throughout. Freeze promptly cooled portions for up to 1 month for quality; thaw in the refrigerator before reheating. Broccoli will soften further.
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