In staking out the premise of this book, called “Will This Make You Happy,” Ms. Bush took a risky bet: The exact thing you said you didn’t want to wade through before reading a recipe online — the origin story, or the particular pleasures of a seasonal ingredient, or any obliquely related anecdote from the recipe writer’s life? You actually want more of that. And as someone who is primarily a dessert maker, Ms. Bush is an expert in knowing when people want more of something.