Professor Nutz holding a jar of Birthday Butter
Cake batterFlavor No. 04

Birthday Butter Peanut Butter

Vanilla cake-batter flavor and a confetti of naturally colored sprinkles folded through creamy peanut butter. It tastes like the frosting bowl on your birthday. A celebration your goals can actually attend.

  • 64Calories†
  • 6GProtein
  • 4GTotal sugars
  • 0GDigested fat†
$18.99About $1.73 a serving · 11 servings a jar

  • 11 servings a jar
  • Digestibility Corrected†
  • Peer-reviewed platform
Class is in session. Scroll down for the science.
Lesson 1

Party in a jar. Zero nonsense.

What's in the jar, and why it's there.

Professor Nutz pouring natural fiber into a bowl of peanut butter in his lab
Fig. 1: The Professor, adding the fiber.
  1. 1

    Dry-roasted peanuts

    The Professor Nutz base, roasted for deep peanut flavor.

  2. 2

    Natural sprinkles

    Colored with beet juice, vegetable juice, annatto, spirulina, turmeric, beta-carotene and paprika.

  3. 3

    Mini marshmallows & French vanilla

    Dehydrated mini marshmallows and natural French vanilla for the cake-batter taste.

  4. 4

    Vegetable fiber

    The heart of Digestibility Corrected. It binds to fat in the gut, so more of it passes through undigested.

  5. 5

    Sweetener blend

    Erythritol, monk fruit and stevia, plus soluble tapioca fiber, thaumatin and stevia.

Allergens: Contains peanuts. Check the jar label for full allergen information.
The full ingredient list: Dry Roasted Peanuts, Sweetener (Erythritol, Monk Fruit, Stevia), Natural Sprinkles (Sugar, Palm Kernel & Palm Oil, Corn Starch, Colored with Beet Juice, Vegetable Juice, Annatto Extract, Spirulina Extract, Turmeric, Beta-Carotene, Paprika Oleoresin, Sunflower Lecithin, Maltodextrin, Carnauba Wax, Cellulose Gum), Vegetable Fiber, Dehydrated Mini Marshmallows, Natural Flavor, Glycerol Monostearate, Salt, Sweetener (Soluble Tapioca Fiber, Thaumatin, Stevia), Natural French Vanilla.
Lesson 2

64 calories. Digestibility, corrected.

Get your scientific brain on for a moment.

Professor Nutz at a chalkboard pointing at E=PB squared

  1. What you eat isn't what you absorb

    Normal labels count every calorie in the food. Digestibility Corrected is an FDA term for correcting that count to the calories a food actually yields.

  2. Fiber binds to fat

    Professor Nutz adds natural fiber that binds to fat in the gut, so more of it passes through undigested.

  3. What lands on the label

    64 calories, 0g digested fat and 12g digested carbs per two-tablespoon serving, with 6g of protein.

E=PB²

Lab results

Typical peanut butter, 2 tbsp (32g)*This jar, 2 tbsp (34g)†
Calories
19064
Fat
16g0g digested

*Typical smooth peanut butter, 32g: USDA FoodData Central, rounded, for general reference. †Digestibility Corrected; digestibility may vary on an individual basis.

Copycats copy labels. They can't copy a study.

Plenty of jars talk about low calories now. Ask to see their own published, peer-reviewed study. Ours is right up there.

Professor Nutz holding a clipboard, ready to quiz you

Pencils out. Three questions, no partial credit.

Pop quiz

Think you know peanut butter?

Q1.Two tablespoons of regular peanut butter has about how many calories?

Q2.What colors the sprinkles in Birthday Butter?

Q3.What does the natural fiber in Professor Nutz do?

Lesson 3: Homework

Spoon it. Spread it.

Homework you'll actually want to do.

  1. Assignment 1

    Straight off the spoon

    Two tablespoons, 64 calories†, 6g protein. Make a wish.

  2. Assignment 2

    Cake-batter yogurt bowl

    Stir a spoonful into Greek yogurt and top with berries.

  3. Assignment 3

    Rice cake party

    Spread it on a rice cake and add sliced strawberries.

  4. Assignment 4

    Pancake topper

    A warm spoonful on protein pancakes. Birthday breakfast, any day.

  5. Extra credit

    Frozen bites

    Dollop onto parchment, freeze 30 minutes, snack on confetti bites.

A jar of Birthday Butter

Stir before use

It's a natural nut butter, so it can separate. A good stir brings it right back.

Two level tablespoons

That's one serving. Measure it once and you'll see how generous 64 calories† can be.

The fine print

The label, by the numbers.

No asterisks hiding anywhere. Well, one dagger.

Nutrition Facts†

Serving size: 2 Tbsp (34g)
11 servings per jar
Calories per serving: 64

Total Digested Fat 0g0%
Saturated Fat 0g0%
Trans Fat 0g
Polyunsaturated Fat 0g
Monounsaturated Fat 0g
Total Digested Cholesterol 0g0%
Total Digested Carbs 12g
Dietary Fiber 2g7%
Total Sugars 4g
Includes 0g Added Sugars
Protein 6g
Sodium 150mg7%
Potassium 160mg4%
Vitamin A 0 IU0%
Vitamin C 0mg0%
Vitamin D 0 IU0%
Calcium 20mg2%
Iron 0.4mg2%

†Nutritional Facts are Digestibility Corrected. Digestibility Corrected is an FDA term used to represent a correction in calorific yields from a food or macronutrient. Digestibility may vary on an individual basis. The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

64Calories†
6GProtein
0GDigested fat†
12GDigested carbs†
Serving size
2 Tbsp (34g)
Servings
11 per jar
Per serving
About $1.73
Made for
Professor Nutz LLC, Knoxville, TN
Professor Nutz raising a finger to answer a question

Raise your hand. Office hours are always open.

Office hours

Ask the Professor.

Is it really only 64 calories?
Yes, Digestibility Corrected†. That's the calories your body actually yields from a two-tablespoon serving, not a conventional count of everything in the jar. Digestibility can vary from person to person.
What does Digestibility Corrected mean?
It's an FDA term for correcting a label's calorie count to the calories a food actually yields. Professor Nutz adds natural fiber that binds to fat in the gut, so more of it passes through undigested.
Are the sprinkles naturally colored?
Yes. They're colored with beet juice, vegetable juice, annatto, spirulina, turmeric, beta-carotene and paprika.
Has it been studied?
The original Professor Nutz peanut butter was the subject of a published, peer-reviewed pilot study in 2020: two weeks of overfeeding with no significant fat gain.
Why does it separate?
It's real peanut butter, so natural oils can rise to the top over time. Stir them back in and you're good.
Who should skip it?
Anyone with a peanut allergy. Contains peanuts. Check the jar label for full allergen information.
Class roster

Who it's for.

  • High-protein snackers
  • The late-night sweet tooth
  • Lunchbox packers
  • Athletes on a cut
  • Calorie-conscious eaters
  • Anyone who loves peanut butter

Meet the family.

Every Professor Nutz jar runs on the same Digestibility Corrected† science. Pick a flavor, any flavor.

Old School SmoothOld School Smooth36 cal†Nutz About ChocolateNutz About Chocolate34 cal†Salty CaramelSalty Caramel34 cal†
You are hereBirthday ButterBirthday Butter64 cal†
Sold outCoconut MacaroonCoconut Macaroon40 cal†Prince of PistachioPrince of Pistachio44 cal†Cookie N CreamCookie N Cream64 cal†

Class dismissed.Grab a spoon.

64 calories†, 6g protein and 0g digested fat† per serving. Birthday Butter, corrected.

$18.99
A jar of Professor Nutz Birthday Butter

†Nutritional Facts are Digestibility Corrected. Digestibility Corrected is an FDA term used to represent a correction in calorific yields from a food or macronutrient. Digestibility may vary on an individual basis.

*Comparison values for typical peanut butter are from USDA FoodData Central, rounded, for general reference only. Professor Nutz™ is a trademark of Professor Nutz LLC.