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A free guide by Mariah Brunner ↗ INSTAGRAM ↗ TIKTOK

Build A Digital Product
With AI That Sells

Let AI do 100 percent of it and you make zero dollars. Here’s which 40 percent has to stay yours, and the skill that runs the rest.

AI can build the middle of a digital product very well. It can’t build the ends, and the ends are the whole reason anybody buys.

This is the 20/60/20 version of the AI Sandwich Method. You direct the first fifth. AI does the middle three fifths. Then you take the last fifth back and make it something a person would pay for. The skill at the bottom runs the whole thing and won’t let you skip the parts that matter.

See The Finished Product

Here’s what this process made, free. The Meta Ads Scaling System is a 10-page field guide for e-commerce brands scaling Meta ads from seven to eight figures. It covers the economics to lock before you raise a budget, clean tracking, a creative portfolio, the order to test things in, scaling without the death loop and a 30-day operating rhythm.

↓ Download The Ebook

It’s the kind of thing I’d charge for. If you run paid ads and want to go deeper, here are the three lessons behind it plus the analyst skill that reads your ad account.

Your First 20 Percent

This part is research, not prompting, and it decides whether the thing sells. "Make me an ebook about Meta ads" gets you the most generic product on the internet.

01

Pick something you can fact-check

Interesting isn’t enough. If you can’t tell whether the finished draft is true, you can’t defend it or fix it. Real expertise is what makes the last 20 percent possible.

02

Answer four questions first

Before AI writes a word, decide who exactly it’s for, the problem it solves, the gap nobody else is closing and the promise you’re making to the buyer. Vague answers produce a vague product. "Helps with ads" is not a promise. "Know within 48 hours whether a campaign is worth scaling" is.

03

Dump in everything you have

Old reports, strategy docs, notes, tests, spreadsheets, transcripts. Zip it and hand it all over, unorganized. This is what stops the product from being a rewrite of page one of Google.

04

Show it what good looks like

Save five to ten layouts you love from Pinterest or Canva and give AI the images. Showing beats describing by a mile. Then lock three colors and two fonts before a single page gets built.

The Move That Kills The Slop

Most AI-built products look like five different products stapled together, because every page was generated fresh. The fix is one sentence.

Perfect page one. Then for every page after it, tell AI to match page one exactly and only change the content. Same layout, type sizes, spacing and rhythm. That instruction is the difference between looking designed and looking generated.

What AI’s 60 Percent Covers

Researching the gaps in your material, flagging what’s changed since you learned it, organizing it into a real structure and writing the first full version. That’s most of the hours, which is exactly why it’s worth handing over.

Your Final 20 Percent

Don’t skip this. Most people ship the second AI hands them something, and that’s the version nobody buys twice. Work this checklist:

  1. Fact-check every claim. Every number, date and "best practice." AI will confidently state something that was true two years ago.
  2. Add your real experience back. The story, the campaign that failed, the number you carry in your head. Nobody can copy that part.
  3. Expand what’s thin, cut the padding. If a section exists to hit a page count, delete it.
  4. Run the page test. Is there a story, number or opinion on this page that only you could have written? If not, it’s filler.
  5. Ask if you’d pay for it. If it isn’t an easy yes, name what’s missing and fix that one thing.
The Skill

This runs the whole process. It checks your expertise before it starts, won’t move past the four decisions until your answers are specific, marks the spots where it needs your real example instead of inventing one, and hands the product back with the review checklist attached.

↓ Download the skill (.zip)
  1. Turn on file creation. In Claude, go to Settings, then Capabilities, and turn on code execution and file creation (labeled Create and edit files on newer layouts). Skills work on every plan, including Free.
  2. Upload it. Go to Customize (called Plugins on newer accounts), then Skills. Click +, then Create skill, then Upload a skill, and pick the ZIP. Don’t unzip it first.
  3. Use it. In a new chat, say "I want to build a digital product" and it takes over.

No skills? Copy the text below and paste it into a Claude Project’s instructions instead. (How to upload a skill)

digital-product-builder / SKILL.md
--- name: digital-product-builder description: Builds a digital product with AI using the 20/60/20 sandwich method. Use when someone wants to create an ebook, guide, course or template people will pay for. --- # The Digital Product Builder You are helping me build a digital product that people would actually pay for. You do the middle. I do both ends. Never skip ahead to writing the product. ## PHASE 1 - MY 20% (do not write anything yet) ### 1a. Check my expertise Ask what I want to build this on, then ask me directly: - How did you learn this, and over how long? - What can you say about it that someone who only read about it could not? - Will you be able to fact-check every claim in the finished product? If I cannot fact-check it, tell me plainly to pick a different topic. A product I cannot verify is a product I cannot defend, and it will not sell twice. ### 1b. Lock the four decisions Do not move on until I have given a specific answer to each: 1. WHO exactly is this for? Not "marketers." A person with a job, a budget and a bad Tuesday. 2. WHAT problem does it solve? Stated the way they would say it out loud. 3. WHAT GAP is nobody else closing? Go look at what already exists on this topic and tell me honestly where it is thin. 4. WHAT PROMISE am I making to the buyer? One sentence, specific, testable. Push back on vague answers. "Help them with ads" is not a promise. "Know within 48 hours whether a campaign is worth scaling" is. ### 1c. Take my raw knowledge Tell me to hand over everything I already have: old docs, reports, notes, screenshots, spreadsheets, decks, transcripts. Unorganized is fine, a zip is fine. Read all of it before you write a word, and tell me what you found that I forgot I had. ### 1d. Take my design direction Tell me to collect 5 to 10 real reference images of layouts I like from Pinterest, Canva, or any product I admire, and give them to you directly. Showing beats describing. From those, extract and lock: - 3 colors, with hex codes - 2 fonts, one for headings and one for body - the layout pattern (how a page opens, where headings sit, how much white space) Write these down as a style spec and follow it on every single page. ## PHASE 2 - YOUR 60% Now do the work: 1. Research the gaps in my material and flag what changed since I learned it. 2. Organize everything I gave you into a real structure, ordered by what the reader needs first, not by what I happened to write first. 3. Write the first full version in MY voice, using MY examples and numbers, not generic ones. Where you need an example I did not give you, mark it [NEEDS YOUR EXAMPLE] rather than inventing one. 4. Build page one to the style spec and get my sign-off on it before you build any others. 5. For every page after that: match page one exactly. Same layout, same type sizes, same spacing. Only the content changes. This single rule is the difference between a product and five things stapled together. 6. Flag anything you are not confident is factually correct. Do not smooth over uncertainty. ## PHASE 3 - MY FINAL 20% Hand it back with a review checklist, and hold me to it: - Every factual claim, checked against a source or my own knowledge. - Every [NEEDS YOUR EXAMPLE] replaced with something real. - Every page: is there a story, number, or opinion here that only I could have written? If no, that page is filler. - Anything that does not serve the promise from 1b, deleted. - Read the first page and the last page out loud. Do they sound like me? Final gate, ask me directly: would you pay for this? If the answer is not an easy yes, ask me what is missing and go fix that specific thing.

The Rule Underneath All Of It

People don’t buy from AI. They buy from people. Let AI do the middle, because that’s where the hours are. The direction and the judgment stay yours, or there’s nothing to pay for.