Chocolate Peanut Butter Oat Tart (2024)

This tart features a cocoa oat crust, honey peanut butter mousse, and a luscious chocolate glaze on top!

I always love a good challenge.

Instinctively, when I think of peanut butter and oatmeal, I assume cookies. Cookies are tasty and all, but I prefer the unexpected.

For the month of October, Peanut Butter & Company has partnered up with Bob’s Red Mill to create #Oatober!

PB&Co. sent me a jar of peanut butter (their honey version!) and a package of Bob’s Red Mill organic old fashioned rolled oats. No rules, no obligations, no limitation. Complete creative freedom.

When it came time to making something, I followed my stomach. My stomach said make a peanut butter oat tart and cover it with chocolate. DONE.

Chocolate Peanut Butter Oat Tart

I’m not exaggerating when I say that this tart is AMAZING. The oat crust is a delicious treat in itself.

It’s a combination of rolled oats, graham cracker and cocoa powder. Barely pulse the oats in the food processor. I wanted to keep retain the oatiness of the rolled oats. I did not want to end up with oat flour.

The crunchy and substantial crust balances the delicate honey peanut butter mousse.

To ensure the dessert isn’t too sweet, I used dark chocolate chips (at least 60% cacao bittersweet chocolate) for the glaze and a handful of cacao nibs to top it off.

You’ll need a 9.5-inch tart pan with a removable bottom.

(These Gobel nonstick tart pans are my favorite. They’re made in France and they last FOREVER. I’ve had mine for over ten years and I love it. You can find it at Sur la Table or get a similar tart pan on Amazon.)

Pulse all the tart ingredients in a food processor and then press it into the bottom and sides of the tart pan. I suggest using the flat bottom of a drinking glass or a measuring cup to push the crust mixture into the pan.

During baking, the crust may puff up slightly. Upon removal from the oven, simply use the glass/cup to deflate the crust and push it back into the pan.

Allow the tart crust to cool completely before adding the mousse filling. (Otherwise, the mousse will melt!)

It’s a good idea to prepare the chocolate glaze BEFORE making the mousse. The glaze will need to cool slightly before you can use it.

The honey peanut butter mousse is fairly straight forward. Whip up chilled heavy cream (in a chilled bowl works best!) to medium peaks and then add in the peanut butter, honey, and salt.

Whip just until almost stiff peaks. Scoop the mousse into the cooled tart crust. Spread the mousse into an even layer.

If your chocolate glaze is taking awhile to cool down, place the mousse tart in the fridge.

Just be careful! If your mousse tart is too cold, the chocolate glaze will instantly thicken and set up.

My advice, melt the glaze. Let it cool for 10 minutes or so and then proceed with making the mousse. By the time you’ve filled the tart, the glaze should be good to go.

As soon as you pour on the chocolate glaze, immediately spread it into an even layer, making sure the glaze makes contact with the crust. Sprinkle onthe cacao nibs and let the tart chill in the fridge until you’re ready to eat.

It’s a million times easier to slice this tart when it’s chilled.

To ensure clean slices, you a sharp knife and wipe your blade clean after each cut.

As the tart sits out at room temperature, the mousse may start to soften (depending on the temperature of the room) making it super frustrating and messy to slice.

Disclosure: I was not compensated for this post. Peanut Butter & Company provided me with some ingredients. As always, all opinions are my own.