Please recommend a hearty diet shake for busy mornings! Haha

These days, I'm trying to eat breakfast every morning to stay healthy, but it's really hard to make one every day. ㅠㅠ So, I'd like to hear some recommendations for easy yet nutritious diet shakes. The ones I tried in the past were either too greasy or the powder didn't mix well, so I gave up, but I've heard that these days there are a lot of recommendations for diet shakes that taste like cafe drinks! ㅋㅋㅋ I think it would be best if you recommend a diet shake that tastes like cereal or nutty millet powder. ㅎㅎ If you know of a product that will keep me full until lunch with just one glass, please share it with me! ㅋㅋㅋ Please help me successfully manage my diet and skin with your favorite products!