Cavallari starts her day early so she can get her kids ready and get to the office on time, so she doesn't usually have the time to make a large spread.
For a quick, weekday breakfast, she'll often make a smoothie, eggs, or espresso overnight oats.
"Sometimes I'll make a little egg bowl and I'll use scrambled eggs, avocado, soft goat cheese, and spinach, and maybe a little hot sauce," she said. "I sautée the spinach and then I throw everything together. It really doesn't take long and you can use the same pan for the spinach as the eggs to have less to clean up."
When she has more time to spend on what she calls her favorite meal of the day, Cavallari said she loves to get creative with it.
"On the weekends, I love the lox breakfast bowl," she said. "It's like the next best thing to a lox bagel. I actually think it's better, to be honest."
You can find the recipe in Cavallari's new cookbook, "True Comfort: More Than 100 Cozy Recipes Free of Gluten and Refined Sugar," released on September 29.