Super Simple Unity Editor Button

BetterObjectEditor.cs

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

[AttributeUsage(AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
public class ButtonAttribute : Attribute {}

[CustomEditor(typeof(UnityEngine.Object), true)]
[CanEditMultipleObjects]
public class BetterObjectEditor : Editor {

    public override void OnInspectorGUI() {
        DrawDefaultInspector();

        var methods = target.GetType().GetMethods(
            BindingFlags.Instance |
            BindingFlags.Static |
            BindingFlags.Public |
            BindingFlags.NonPublic
        );

        foreach (MethodInfo method in methods) {
            if (method.GetCustomAttribute<ButtonAttribute>() == null)
                continue;

            if (GUILayout.Button(method.Name))
                method.Invoke(target, new object[0]);
        }
    }
}

Usage:

public class MyBehaviour : MonoBehaviour {
  
  [Button]
  public void MyMethod() {
    Debug.Log("Ran MyMethod");
  }

}