I think I may be a gluten for punishment here
Pun intended? 
but how do you approach restaurants with small cakes, or cupcakes?
Are you asking about selling your products wholesale to restaurants?
Congratulations on your accomplishments! Now you want to own a business and sell cakes? Excellent!!
Many restaurants would love to purchase homemade desserts. But they are only allowed to buy from licensed facilities. If your state has a cottage law, contact the state/county/municipal agency for requirements. Otherwise, find a commercial kitchen for your production and get a license.
In the meantime, do your market research and find restaurants/eateries that you want to approach. Once you have a license, make samples and put together a price list, then visit the places you have targeted. Good luck!
You'll want to put together a business plan first, which includes your product assortment and cost structures so you can work out pricing at retail and wholesale levels (which may or may not be the same). As Mimi said you'll also need to make sure you are operating legally and have liability insurance coverage.
There are several types of wholesale opportunities out there, including restaurants, coffee shops, grocery stores, specialty stores, caterers, venues, etc. Your sales approach will vary depending on the wholesale customer, what you offer, and what they are looking for. Selling at a farmer's market is considered retail and has its own challenges -- around here it's difficult for non-farmers to get a table, and the amount of profit you can make (once you pay the table fees and take into account the time to make the product and staff the table) is not that great.
Selling vegan cupcakes at a pizza place sounds a little strange since pizza is typically not vegan, unless the restaurant specializes in vegan pizza.
Interesting, never heard of cashew cheese before. A few pizza places around here have vegan options with daiya cheese.
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