Kitchen leftovers are not automatically suitable fertiliser. Consider what a material adds and how it decomposes before placing it around the roots of a potted plant.
Separate composting from feeding a pot
Kitchen scraps can be ingredients for managed composting. That does not make an unmeasured handful of scraps a balanced fertiliser for a houseplant.
Consider what a material will do as it decomposes in the small root environment of a container. Smell, mould and changes in moisture can become practical problems before any useful nutrition is available.
Use information you can measure
For a container plant that needs feeding, a labelled product provides a stated nutrient analysis and application rate. Check whether its growing medium already contains feed before adding more.
Keep raw meat residues, spoiled milk and improvised mixed liquids out of the routine. If you want to recycle suitable plant-based leftovers, use an appropriate composting process and assess the finished material for its intended use. Feeding and improving soil structure are related jobs, but they are not interchangeable.
Related reading: Worm Castings for Plants: Uses, Limits and Mixing.