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Preheat the oven to 180º C (350 º F)
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Toss the eggs, the flour, the milk, the cheese and the oil into the blender and blend in high speed for 5 minutes.
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Add the salt and the baking powder and blend in low speed until you get a homogeneous dough.
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Now to make the filling we need to heat a big pan and pour a little bit of olive oil and saute the onions, the pepper, and the garlic for a couple minutes. Then add the tuna and cook over medium heat for five minutes.
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To assemble the tuna tart: first, you will need to grease a tart pan. Then pour half of the dough. Above place a layer of the tuna filling and cover with the remaining dough. Take it to the oven for 25 minutes.
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Let the tuna tart chill completely. Then cut it into cubes and you can serve or store up to 4 days.