i use an electric skillet but if you don't have then use the largest skillet you have then but you have an electric skillet set the temp on it to 350 but you are using your stove top med high heat will do .
while your skillet is heating . slice your sqaush , your zucchini , onion and pepper . add to your pan your butter and let it melt b4 you throw all your veggies in
after you add your veggies to the melted butter add your seasonings i really don't measure my garlic or onion powder i do it to taste the same with the salt and pepper .
once your veggies start to cook add your olive oil you may add more olive oil if needed cook until the veggies are nice and tender and serve while still warm. depending on how thick u cut your sqaush and zucchini will depend on your cooking time so it make take up to 30 mins or a lil more ..... enjoy! *also it will cook faster in an electric skillet then on your stove top*