Boston Cream Custard

Jul 21, 2026 · By VanillaGoods

Baking Frostings fillings toppings Origin: Madagascar Vanilla: Extract Medium

Filled doughnut cut open to show Boston cream custard

A thick, pipeable Boston cream custard for doughnuts, cooked until it sets firm and holds its shape. Best with Madagascar vanilla (rich, creamy, classic); any pure vanilla works. Makes about 2 1/2 cups; fills 12 doughnuts.

Prep 10 min

Cook 10 min

Chill 2 hr

Total 2 hr 20 min

Yield 12 doughnuts

Diet —

Ingredients

Adjust yield

doughnuts

2.0 cups (480.0 ml)whole milk
2.0 tsp (10.0 ml)VanillaGoods pure vanilla extract
4.0 (72.0 g)large egg yolks
½ cup (100.0 g)granulated sugar
¼ cup (32.0 g)cornstarch
⅛ tspfine sea salt
2.0 tbsp (28.0 g)unsalted butter, cut into pieces

Make it at home

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Instructions

In a medium saucepan, combine the milk and heat over medium heat until steaming, with small bubbles around the edge, about 4 minutes.
Meanwhile, in a medium heatproof bowl, whisk the egg yolks, sugar, cornstarch, and salt until smooth and pale, about 1 minute.
Slowly pour about half of the hot milk into the yolk mixture while whisking constantly, then whisk everything back into the saucepan.
Cook over medium heat, whisking constantly and reaching into the corners of the pan, until the custard thickens and begins to bubble. Keep whisking for 1 minute more so the cornstarch thickens fully and the custard reaches at least 160°F.
Remove from the heat and whisk in the butter and vanilla until smooth. Strain through a fine-mesh sieve into a clean bowl.
Press plastic wrap directly onto the surface and refrigerate until cold and set, at least 2 hours.
Whisk the chilled custard briefly until smooth and creamy.
Spoon the filling into a piping bag fitted with a long filling tip. Poke a small hole in the side of each cooled doughnut and pipe in about 2 tablespoons, until the doughnut feels heavy.

Tips

Whisk constantly once the custard starts to thicken; cornstarch custards scorch quickly on the bottom.
If the chilled custard seems stiff, whisk it for 20 seconds; it loosens and becomes pipeable.
Vanilla swap: use vanilla bean paste 1:1 in place of the extract for visible specks, or the seeds of 1 vanilla bean for each tablespoon of extract.
Best vanilla for this: Madagascar (rich, creamy, classic), or Mexican (spiced, warm, woodsy). Any pure vanilla works.
Storage: Refrigerate the filling, covered, for up to 3 days. Serve filled doughnuts the same day and keep them chilled.

Recipe FAQ

How long does it take to make boston cream custard?

Plan on 10 minutes of prep and 10 minutes of cooking, plus 2 hours to chill. It makes about 2 1/2 cups; fills 12 doughnuts.

How should I store boston cream custard?

Refrigerate the filling, covered, for up to 3 days. Serve filled doughnuts the same day and keep them chilled.

Can I use a different form of vanilla?

use vanilla bean paste 1:1 in place of the extract for visible specks, or the seeds of 1 vanilla bean for each tablespoon of extract.

Estimated · per serving

Nutrition

Per serving = 1 of 12 servings this recipe makes.

106 Calories / serving

4.9g Fat

13.0g Carbs

2.3g Protein

10.6g Sugar

Whole recipe (12 servings): ~1272 cal · 59g fat · 156g carbs · 28g protein · 127g sugar

Estimated values per serving, calculated from standard ingredient data. Not verified Nutrition Facts; actual values vary with brands, measurements, and preparation.

Per serving · 106 calories

What it takes to burn one serving

Brisk walking 20 min·1.2 mi·~2350 steps
Walking uphill or incline treadmill 14 min·0.7 mi·~1400 steps
Moderate cycling 11 min·2.2 mi
Swimming laps 15 min
Jogging 10 min·0.8 mi·~1600 steps
Stair climbing 10 min·~900 steps
Dancing 17 min
Bodyweight circuit training 11 min
Cleaning, errands, or playing with the dog 25 min

Rough estimates for one serving, based on standard MET values at about 155 lb. Your own burn depends on body size, effort, and fitness. Shown for context only — food is not something you have to earn.