This one-bowl apple yogurt cake is deceptively simple. The secret is to use just the right balance of ingredients and spices. Every bite is soft, moist, and full of real apple flavor, and the homemade butterscotch sauce takes it over the top!
Fold in the diced apple and scrape into the prepared bundt pan.
1 large apple
Bake for 55-60 minutes or until a toothpick inserted into the middle comes out clean. Mine usually take a solid hour.
Remove cake from the oven and cool for at least half an hour before removing from the pan. Once the cake is cool, start preparing the butterscotch sauce.
Make the Butterscotch Sauce
In a medium saucepan over medium low heat, warm brown sugar for about 4-5 minutes. The goal isn't to melt the sugar; simply to warm it up.
1/3 cup brown sugar
Add the butter and stir to combine. The mixture will begin to bubble up at this time, which is good. We want to dissolve the sugar crystals and this process will help do that. Continue cooking for about 5-8 minutes.
3 Tbs butter
Add half of the heavy cream and stir to combine. The mixture will begin to spit and bubble quickly, so be aware. Once the cream is stirred in, add the remaining cream and let the mixture continue cooking for 5-10 minutes. You aren't cooking to thicken the sauce, simply to remove any sugar crystals. The butterscotch will still be runny at this point and should have a caramel-like color. Focus more on what it looks like, not following specific times.
1/2 cup heavy cream
Remove the butterscotch sauce from the heat and whisk in the vanilla and salt. Allow the sauce to cool until it reaches room temperature and visibly thickens.
Pinch kosher salt, 1 tsp vanilla extract
Pour the butterscotch over the cake, allowing it to spill down the sides. Slice and serve!