The phrase "mixed with" is often used in a variety of contexts, but there are many synonyms that can be used instead to add variety to your writing. Some possible alternatives include blended with, combined with, amalgamated with, intermingled with, integrated with, mingled with, commingled with, fused with, and infused with. Depending on the tone and style of your writing, other options may include incorporated with, united with, paired with, or even coalesced with. Experimenting with different synonyms can help to make your writing more dynamic and engaging, while also avoiding repetition and monotony.